diff --git a/apps/emqx/src/emqx_schema.erl b/apps/emqx/src/emqx_schema.erl
index 9786d142b..9609f4edc 100644
--- a/apps/emqx/src/emqx_schema.erl
+++ b/apps/emqx/src/emqx_schema.erl
@@ -387,7 +387,7 @@ after idling for 'Keepalive * backoff * 2'."""
     , {"max_inflight",
        sc(range(1, 65535),
           #{ default => 32,
-             desc => "Maximum size of the Inflight Window storing QoS1/2 messages delivered but unacked."
+             desc => "Maximum size of the Inflight Window storing QoS1/2 messages delivered but un-acked."
            })
       }
     , {"retry_interval",
@@ -550,7 +550,7 @@ fields("overload_protection") ->
            })}
     , {"backoff_delay",
        sc(range(0, inf),
-          #{ desc => "Some unimporant tasks could be delayed"
+          #{ desc => "Some unimportant tasks could be delayed "
                      "for execution, here set the delays in ms"
            , default => 1
            })}
@@ -904,7 +904,7 @@ fields("broker") ->
            })}
     , {"perf",
        sc(ref("broker_perf"),
-          #{ desc => "Broker performance tuning pamaters"
+          #{ desc => "Broker performance tuning parameters"
            })
       }
     ];
@@ -1032,35 +1032,35 @@ in the VM exceeds this value"
     , {"db_hostname",
        sc(string(),
          #{ mapping => "system_monitor.db_hostname"
-          , desc => "Hostname of the postgres database that collects the data points"
+          , desc => "Hostname of the PostgreSQL database that collects the data points"
           })
       }
     , {"db_port",
        sc(integer(),
          #{ mapping => "system_monitor.db_port"
           , default => 5432
-          , desc => "Port of the postgres database that collects the data points"
+          , desc => "Port of the PostgreSQL database that collects the data points"
           })
       }
     , {"db_username",
        sc(string(),
          #{ mapping => "system_monitor.db_username"
           , default => "system_monitor"
-          , desc    => "EMQX user name in the postgres database"
+          , desc    => "EMQX user name in the PostgreSQL database"
           })
       }
     , {"db_password",
        sc(binary(),
          #{ mapping => "system_monitor.db_password"
           , default => "system_monitor_password"
-          , desc    => "EMQX user password in the postgres database"
+          , desc    => "EMQX user password in the PostgreSQL database"
           })
       }
     , {"db_name",
        sc(string(),
          #{ mapping => "system_monitor.db_name"
           , default => "postgres"
-          , desc    => "Postgres database name"
+          , desc    => "PostgreSQL database name"
           })
       }
     ];
@@ -1111,7 +1111,7 @@ fields("trace") ->
         default => text,
         desc => """
 Determine the format of the payload format in the trace file.<br>
-`text`: Text-based protocol or plain text protocol. It is recommended when payload is json encode.<br>
+`text`: Text-based protocol or plain text protocol. It is recommended when payload is JSON encoded.<br>
 `hex`: Binary hexadecimal encode. It is recommended when payload is a custom binary protocol.<br>
 `hidden`: payload is obfuscated as `******`
         """
@@ -1264,7 +1264,7 @@ keyfile is password-protected."""
           #{ default => default_tls_vsns(maps:get(versions, Defaults, tls_all_available))
            , desc =>
 """All TLS/DTLS versions to be supported.<br>
-NOTE: PSK ciphers are suppresed by 'tlsv1.3' version config<br>
+NOTE: PSK ciphers are suppressed by 'tlsv1.3' version config<br>
 In case PSK cipher suites are intended, make sure to configured
 <code>['tlsv1.2', 'tlsv1.1']</code> here.
 """
@@ -1361,7 +1361,7 @@ client_ssl_opts_schema(Defaults) ->
             , desc =>
 """Specify the host name to be used in TLS Server Name Indication extension.<br>
 For instance, when connecting to \"server.example.net\", the genuine server
-which accedpts the connection and performs TLS handshake may differ from the
+which accepts the connection and performs TLS handshake may differ from the
 host the TLS client initially connects to, e.g. when connecting to an IP address
 or when the host has multiple resolvable DNS records <br>
 If not specified, it will default to the host name string which is used
@@ -1405,7 +1405,7 @@ Selecting a good cipher suite is critical for the
 application's data security, confidentiality and performance.
 
 The names should be in OpenSSL string format (not RFC format).
-All default values and examples proveded by EMQ X config
+All default values and examples provided by EMQ X config
 documentation are all in OpenSSL format.<br>
 
 NOTE: Certain cipher suites are only compatible with
@@ -1415,7 +1415,7 @@ For instance, if only 'tlsv1.3' is given in the <code>versions</code>,
 configuring cipher suites for other versions will have no effect.
 <br>
 
-NOTE: PSK ciphers are suppresed by 'tlsv1.3' version config<br>
+NOTE: PSK ciphers are suppressed by 'tlsv1.3' version config<br>
 If PSK cipher suites are intended, 'tlsv1.3' should be disabled from <code>versions</code>.<br>
 PSK cipher suites: <code>\"RSA-PSK-AES256-GCM-SHA384,RSA-PSK-AES256-CBC-SHA384,
 RSA-PSK-AES128-GCM-SHA256,RSA-PSK-AES128-CBC-SHA256,
@@ -1469,7 +1469,7 @@ ref(Module, Field) -> hoconsc:ref(Module, Field).
 
 mk_duration(Desc, OverrideMeta) ->
     DefaultMeta = #{desc => Desc ++ " Time span. A text string with number followed by time units:
-                    `ms` for milli-seconds,
+                    `ms` for milliseconds,
                     `s` for seconds,
                     `m` for minutes,
                     `h` for hours;
diff --git a/apps/emqx_authz/README.md b/apps/emqx_authz/README.md
index bda09481a..8c05f21be 100644
--- a/apps/emqx_authz/README.md
+++ b/apps/emqx_authz/README.md
@@ -2,7 +2,7 @@
 
 ## Configure
 
-File: etc/pulgins/authz.conf
+File: etc/plugins/authz.conf
 
 ```json
 authz:{
@@ -72,7 +72,7 @@ authz:{
 
 ## Database Management
 
-#### Mysql
+#### MySQL
 
 Create Example Table
 
@@ -133,7 +133,7 @@ HSET mqtt_authz:emqx '$SYS/#' subscribe
 
 A rule of Redis AuthZ defines `publish`, `subscribe`, or `all `information. All lists in the rule are **allow** lists.
 
-#### Mongo
+#### MongoDB
 
 Create Example BSON documents
 ```sql
diff --git a/apps/emqx_authz/src/emqx_authz_postgresql.erl b/apps/emqx_authz/src/emqx_authz_postgresql.erl
index bf33c95c3..0da8caaff 100644
--- a/apps/emqx_authz/src/emqx_authz_postgresql.erl
+++ b/apps/emqx_authz/src/emqx_authz_postgresql.erl
@@ -43,7 +43,7 @@
                        ?PH_CERT_SUBJECT]).
 
 description() ->
-    "AuthZ with Postgresql".
+    "AuthZ with PostgreSQL".
 
 init(#{query := SQL0} = Source) ->
     {SQL, PlaceHolders} = emqx_authz_utils:parse_sql(
diff --git a/apps/emqx_bridge/src/emqx_bridge_schema.erl b/apps/emqx_bridge/src/emqx_bridge_schema.erl
index 00d461098..e6231a0be 100644
--- a/apps/emqx_bridge/src/emqx_bridge_schema.erl
+++ b/apps/emqx_bridge/src/emqx_bridge_schema.erl
@@ -98,7 +98,7 @@ fields("metrics") ->
     , {"rate", mk(float(), #{desc => "The rate of matched, times/second"})}
     , {"rate_max", mk(float(), #{desc => "The max rate of matched, times/second"})}
     , {"rate_last5m", mk(float(),
-        #{desc => "The average rate of matched in last 5 mins, times/second"})}
+        #{desc => "The average rate of matched in the last 5 minutes, times/second"})}
     ];
 
 fields("node_metrics") ->
@@ -113,7 +113,7 @@ fields("status") ->
     , {"rate", mk(float(), #{desc => "The rate of matched, times/second"})}
     , {"rate_max", mk(float(), #{desc => "The max rate of matched, times/second"})}
     , {"rate_last5m", mk(float(),
-        #{desc => "The average rate of matched in last 5 mins, times/second"})}
+        #{desc => "The average rate of matched in the last 5 minutes, times/second"})}
     ];
 
 fields("node_status") ->
diff --git a/apps/emqx_conf/etc/emqx_conf.md b/apps/emqx_conf/etc/emqx_conf.md
index 5a5514f58..d9eb59ec7 100644
--- a/apps/emqx_conf/etc/emqx_conf.md
+++ b/apps/emqx_conf/etc/emqx_conf.md
@@ -112,7 +112,7 @@ And a the `EMQX_` prefix is used as the namespace.
 
 For example `node.name` can be represented as `EMQX_NODE__NAME`
 
-Environment variable values are parsed as hocon values, this allows users
+Environment variable values are parsed as HOCON values, this allows users
 to even set complex values from environment variables.
 
 For example, this environment variable sets an array value.
diff --git a/apps/emqx_conf/src/emqx_conf_schema.erl b/apps/emqx_conf/src/emqx_conf_schema.erl
index 113a00a63..50391decc 100644
--- a/apps/emqx_conf/src/emqx_conf_schema.erl
+++ b/apps/emqx_conf/src/emqx_conf_schema.erl
@@ -74,7 +74,7 @@ roots() ->
     [ {"node",
        sc(hoconsc:ref("node"),
           #{ desc => "Node name, cookie, config & data directories "
-                     "and the Eralng virtual machine (beam) boot parameters."
+                     "and the Erlang virtual machine (BEAM) boot parameters."
            })}
     , {"cluster",
        sc(hoconsc:ref("cluster"),
@@ -840,9 +840,9 @@ In EMQ X, MQTT client access control is extremely flexible.<br>
 An out of the box set of authorization data sources are supported.
 For example,<br>
 'file' source is to support concise and yet generic ACL rules in a file;<br>
-'built-in-database' source can be used to store per-client customisable rule sets,
+'built-in-database' source can be used to store per-client customizable rule sets,
 natively in the EMQ X node;<br>
 'http' source to make EMQ X call an external HTTP API to make the decision;<br>
-'postgresql' etc. to look up clients or rules from external databases;<br>
+'PostgreSQL' etc. to look up clients or rules from external databases;<br>
 """ })},
     lists:keyreplace("authorization", 1, Roots, Authz).
diff --git a/apps/emqx_connector/README.md b/apps/emqx_connector/README.md
index 879669f93..265712285 100644
--- a/apps/emqx_connector/README.md
+++ b/apps/emqx_connector/README.md
@@ -6,10 +6,10 @@ A `connector` is a callback module of `emqx_resource` that maintains the data re
 external resources. Put all resource related callback modules in a single application is good as
 we can put some util functions/modules here for reusing purpose.
 
-For example, a mysql connector is an emqx resource that maintains all the mysql connection
-related parameters (configs) and the TCP connections to the mysql server.
+For example, a MySQL connector is an emqx resource that maintains all the MySQL connection
+related parameters (configs) and the TCP connections to the MySQL server.
 
-An mysql connector can be used as following:
+An MySQL connector can be used as following:
 
 ```
 (emqx@127.0.0.1)5> emqx_resource:list_instances_verbose().
diff --git a/apps/emqx_connector/src/mqtt/emqx_connector_mqtt_schema.erl b/apps/emqx_connector/src/mqtt/emqx_connector_mqtt_schema.erl
index b42b10bf0..66d005e7d 100644
--- a/apps/emqx_connector/src/mqtt/emqx_connector_mqtt_schema.erl
+++ b/apps/emqx_connector/src/mqtt/emqx_connector_mqtt_schema.erl
@@ -130,7 +130,7 @@ Template with variables is allowed."""
     , {hookpoint,
         sc(binary(),
            #{ desc => """
-The hookpoint will be triggered when there's any message received from the remote broker.
+The hook point will be triggered when there's any message received from the remote broker.
 """
             })}
     ] ++ common_inout_confs();
diff --git a/apps/emqx_gateway/src/emqx_gateway_schema.erl b/apps/emqx_gateway/src/emqx_gateway_schema.erl
index 4de121587..ecba2b1f2 100644
--- a/apps/emqx_gateway/src/emqx_gateway_schema.erl
+++ b/apps/emqx_gateway/src/emqx_gateway_schema.erl
@@ -164,7 +164,7 @@ fields(coap) ->
        sc(duration(),
           #{ default => <<"30s">>
            , desc =>
-"The gateway server required minimum hearbeat interval.<br>
+"The gateway server required minimum heartbeat interval.<br>
 When connection mode is enabled, this parameter is used to set the minimum
 heartbeat interval for the connection to be alive."
            })}
@@ -377,7 +377,7 @@ fields(udp_tcp_listeners) ->
     ];
 
 fields(tcp_listener) ->
-    [ %% some special confs for tcp listener
+    [ %% some special configs for tcp listener
       {acceptors, sc(integer(), #{default => 16})}
     ] ++
     tcp_opts() ++
@@ -394,7 +394,7 @@ fields(ssl_listener) ->
 
 fields(udp_listener) ->
     [
-     %% some special confs for udp listener
+     %% some special configs for udp listener
     ] ++
     udp_opts() ++
     common_listener_opts();
diff --git a/apps/emqx_gateway/src/lwm2m/README.md b/apps/emqx_gateway/src/lwm2m/README.md
index f97feb12c..1218dc4c5 100644
--- a/apps/emqx_gateway/src/lwm2m/README.md
+++ b/apps/emqx_gateway/src/lwm2m/README.md
@@ -107,7 +107,7 @@ The MQTT message will be translated to an LwM2M DISCOVER command and sent to the
       - "execute": LwM2M Execute
       - "create": LwM2M Create
       - "delete": LwM2M Delete
-    - {?Data}: Json Object, its value depends on the {?MsgType}:
+    - {?Data}: JSON Object, its value depends on the {?MsgType}:
       - **If {?MsgType} = "read" or "discover"**:
         ```json
         {
@@ -212,7 +212,7 @@ The MQTT message will be translated to an LwM2M DISCOVER command and sent to the
     - "create": LwM2M Create
     - "delete": LwM2M Delete
     - **"ack"**: [CoAP Empty ACK](https://tools.ietf.org/html/rfc7252#section-5.2.2)
-  - {?Data}: Json Object, its value depends on {?MsgType}:
+  - {?Data}: JSON Object, its value depends on {?MsgType}:
     - **If {?MsgType} = "write", "write-attr", "execute", "create", "delete", or "read"(when response without content)**:
       ```json
       {
diff --git a/apps/emqx_modules/src/emqx_modules_schema.erl b/apps/emqx_modules/src/emqx_modules_schema.erl
index e207830b1..3edded03f 100644
--- a/apps/emqx_modules/src/emqx_modules_schema.erl
+++ b/apps/emqx_modules/src/emqx_modules_schema.erl
@@ -90,10 +90,10 @@ fields("event_message") ->
     #{fields => Fields,
       desc => """
 Enable/Disable system event messages.
-The messages are plublished to '$event' prefixed topics.
+The messages are published to '$event' prefixed topics.
 For example, if `client_disconnected` is set to `true`,
 a message is published to `$event/client_connected` topic
-whenver a client is connected.
+whenever a client is connected.
 """};
 
 fields("topic_metrics") ->
diff --git a/apps/emqx_plugins/src/emqx_plugins_schema.erl b/apps/emqx_plugins/src/emqx_plugins_schema.erl
index ab9e81834..72313640c 100644
--- a/apps/emqx_plugins/src/emqx_plugins_schema.erl
+++ b/apps/emqx_plugins/src/emqx_plugins_schema.erl
@@ -51,7 +51,7 @@ state_fields() ->
     [ {name_vsn,
        hoconsc:mk(string(),
                   #{ desc => "The {name}-{version} of the plugin.<br>"
-                             "It should match the plugin application name-vsn as the "
+                             "It should match the plugin application name-version as the "
                              "for the plugin release package name<br>"
                              "For example: my_plugin-0.1.0."
                    , nullable => false
diff --git a/apps/emqx_psk/src/emqx_psk_schema.erl b/apps/emqx_psk/src/emqx_psk_schema.erl
index ce57ab3fc..b3d342360 100644
--- a/apps/emqx_psk/src/emqx_psk_schema.erl
+++ b/apps/emqx_psk/src/emqx_psk_schema.erl
@@ -49,7 +49,7 @@ fields() ->
     ].
 
 enable(type) -> boolean();
-enable(desc) -> <<"Whether to enable tls psk support">>;
+enable(desc) -> <<"Whether to enable TLS PSK support">>;
 enable(default) -> false;
 enable(_) -> undefined.
 
@@ -58,7 +58,8 @@ init_file(desc) ->
     <<"If init_file is specified, emqx will import PSKs from the file ",
       "into the built-in database at startup for use by the runtime. ",
       "The file has to be structured line-by-line, each line must be in ",
-      "the format of 'PSKIdentity:SharedSecret' for example: mydevice1:c2VjcmV0">>;
+      "the format of 'PSKIdentity:SharedSecret' for example: ",
+      "<code>mydevice1:c2VjcmV0</code>">>;
 init_file(nullable) -> true;
 init_file(_) -> undefined.
 
diff --git a/apps/emqx_rule_engine/src/emqx_rule_api_schema.erl b/apps/emqx_rule_engine/src/emqx_rule_api_schema.erl
index 8b788cd59..e91a95802 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_api_schema.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_api_schema.erl
@@ -87,7 +87,7 @@ fields("metrics") ->
     , {"sql.matched.rate", sc(float(), #{desc => "The rate of matched, times/second"})}
     , {"sql.matched.rate.max", sc(float(), #{desc => "The max rate of matched, times/second"})}
     , {"sql.matched.rate.last5m", sc(float(),
-        #{desc => "The average rate of matched in last 5 mins, times/second"})}
+        #{desc => "The average rate of matched in last 5 minutes, times/second"})}
     , {"sql.passed", sc(integer(), #{desc => "How much times the SQL is passed"})}
     , {"sql.failed", sc(integer(), #{desc => "How much times the SQL is failed"})}
     , {"sql.failed.exception", sc(integer(), #{
diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl b/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl
index ff9579b8b..66a67a0aa 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl
@@ -101,7 +101,7 @@ Then there are 3 variables available: <code>clientid</code>, <code>qos</code> an
     }
 </code>
 When the rule is triggered by an MQTT message with payload = \"hello\", qos = 1,
-clientid = \"steve\", the rule will republish a new MQTT message to topic \"t/steve\",
+clientid = \"Steve\", the rule will republish a new MQTT message to topic \"t/Steve\",
 payload = \"msg: hello\", and qos = 1.
 """
          , default => #{}
diff --git a/apps/emqx_slow_subs/src/emqx_slow_subs_schema.erl b/apps/emqx_slow_subs/src/emqx_slow_subs_schema.erl
index 7a1b57d0b..91beca4ae 100644
--- a/apps/emqx_slow_subs/src/emqx_slow_subs_schema.erl
+++ b/apps/emqx_slow_subs/src/emqx_slow_subs_schema.erl
@@ -26,7 +26,7 @@ fields("slow_subs") ->
        sc(emqx_schema:duration_ms(),
           "0s",
           "The interval for pushing statistics table records to the system topic. "
-          "publish topk list to $SYS/brokers/${node}/slow_subs per notice_interval. "
+          "publish top-k list to $SYS/brokers/${node}/slow_subs per notice_interval. "
           "publish is disabled if set to 0s."
          )}
     , {notice_qos,
diff --git a/scripts/dict/.aspell.en b/scripts/dict/.aspell.en
new file mode 100644
index 000000000..84a57c975
--- /dev/null
+++ b/scripts/dict/.aspell.en
@@ -0,0 +1,246 @@
+personal_ws-1.1 en 254
+ACL
+AES
+APIs
+BPAPI
+BSON
+Backplane
+CHACHA
+CLI
+CMD
+CN
+CONNACK
+CoAP
+Cygwin
+DES
+DN
+DNS
+DTLS
+DevOps
+Dialyzer
+Diffie
+EIP
+EMQ
+EPMD
+ERL
+ETS
+FIXME
+GCM
+Gw
+HOCON
+HTTPS
+JSON
+Kubernetes
+LwM
+MQTT
+Makefile
+MitM
+Multicast
+NIF
+OTP
+PEM
+PINGREQ
+PSK
+PUBREL
+QoS
+RESTful
+ROADMAP
+RSA
+Req
+Riak
+SHA
+SMS
+Struct
+TCP
+TLS
+TTL
+UDP
+URI
+XMLs
+acceptors
+ack
+acked
+addr
+api
+apiserver
+arg
+args
+async
+attr
+auth
+authenticator
+authenticators
+authn
+authz
+autoclean
+autoheal
+backend
+backends
+backoff
+backplane
+backtrace
+badarg
+badkey
+bcrypt
+behaviour
+bhvr
+boolean
+bytesize
+cacert
+cacertfile
+certfile
+ci
+clientid
+clientinfo
+cmake
+coap
+conf
+config
+configs
+confirmable
+conn
+connectionless
+cors
+cpu
+ctx
+customizable
+desc
+dir
+dns
+downlink
+downlink
+dtls
+ekka
+emqx
+enablement
+enqueue
+enqueued
+env
+eof
+epmd
+erl
+erts
+escript
+etcd
+eval
+exe
+executables
+exhook
+exproto
+extensibility
+formatter
+gRPC
+github
+goto
+grpcbox
+hocon
+hoconsc
+hostname
+hrl
+http
+https
+iface
+img
+impl
+inet
+inflight
+ini
+init
+ip
+ipv
+jenkins
+jq
+kb
+keepalive
+libcoap
+lifecycle
+localhost
+lwm
+mnesia
+mountpoint
+mqueue
+mria
+msg
+multicalls
+multicasts
+namespace
+natively
+nodelay
+nodetool
+nullable
+num
+os
+params
+peerhost
+peername
+perf
+powershell
+procmem
+procs
+progname
+prometheus
+proto
+ps
+psk
+pubsub
+qlen
+qmode
+qos
+quic
+ratelimit
+rebar
+recbuf
+relup
+replayq
+replicant
+repo
+reuseaddr
+rh
+rlog
+rootdir
+rpc
+runtime
+sc
+scalable
+seg
+setcookie
+sharded
+shareload
+sn
+sndbuf
+sockname
+sql
+src
+ssl
+statsd
+structs
+subprotocol
+subprotocols
+superset
+sys
+sysmem
+sysmon
+tcp
+ticktime
+tlog
+tls
+tlsv
+travis
+trie
+ttl
+typerefl
+udp
+uid
+unsub
+uplink
+url
+utc
+util
+ver
+vm
+vsn
+wakaama
+websocket
+ws
+wss
+xml
diff --git a/scripts/spellcheck b/scripts/spellcheck
new file mode 100755
index 000000000..37d72281f
--- /dev/null
+++ b/scripts/spellcheck
@@ -0,0 +1,72 @@
+#!/bin/bash
+# shellcheck disable=SC2015
+set -euo pipefail
+
+aspell -v > /dev/null && [ "$#" -eq 1 ] || {
+    echo "Usage:
+  $(basename "$0") check
+or
+  $(basename "$0") fix
+
+Note: this script needs aspell to run"
+    exit 1
+}
+
+action=$1
+
+dict_dir="$(git rev-parse --show-toplevel)/$(dirname "$0")/dict"
+echo "${dict_dir}"
+dict="${dict_dir}/.aspell.en"
+
+export fail=0
+
+aspellcmd() {
+    local mode
+    mode="${1}"
+    shift
+    aspell --mode "${mode}" --camel-case --add-filter html --add-html-skip code -p "$dict" "$@"
+}
+
+check() {
+    local mode file typos ntypos
+    mode="$1"
+    file="$2"
+
+    echo "!! Spellchecking ${file}"
+    typos="$(mktemp)"
+    echo "!! Typos:"
+    aspellcmd "$mode" list < "$file" |
+        sort -u |
+        tee "$typos"
+    ntypos="$(wc -l "$typos")"
+    rm "$typos"
+    [ "$ntypos" = 0 ] || export fail=1
+}
+
+fix() {
+    local mode file
+    mode=$1
+    file=$2
+
+    aspellcmd "$mode" check "$file"
+}
+
+case $action in
+    fix)
+        for i in $(git ls-tree -r --name-only HEAD | grep -E '_schema.erl$'); do
+            fix perl "$i"
+        done
+        # for i in $(git ls-tree -r --name-only HEAD | grep -E '.md$'); do
+        #     fix markdown $i
+        # done
+    ;;
+    *)
+        check markdown _build/emqx/lib/emqx_dashboard/priv/www/static/config.md
+esac
+
+
+if [ $fail -eq 1 ]; then
+    echo
+    echo "!! Bad spelling in the documentation. Run script in fix mode to resolve problems."
+    exit 1
+fi