diff --git a/etc/emq.conf b/etc/emq.conf
index e4434283a..fd615c227 100644
--- a/etc/emq.conf
+++ b/etc/emq.conf
@@ -11,6 +11,11 @@ node.cookie = emq_dist_cookie
 ## SMP support: enable, auto, disable
 node.smp = auto
 
+## vm.args: -heart
+## Heartbeat monitoring of an Erlang runtime system
+## Value should be 'on' or comment the line
+## node.heartbeat = on
+
 ## Enable kernel poll
 node.kernel_poll = on
 
@@ -219,12 +224,12 @@ mqtt.listener.http.acceptors = 4
 mqtt.listener.http.max_clients = 64
 
 ## HTTP(SSL) Listener
-## mqtt.listener.https = 8084
-## mqtt.listener.https.acceptors = 4
-## mqtt.listener.https.max_clients = 64
-## mqtt.listener.https.handshake_timeout = 15
-## mqtt.listener.https.certfile = etc/certs/cert.pem
-## mqtt.listener.https.keyfile = etc/certs/key.pem
+mqtt.listener.https = 8084
+mqtt.listener.https.acceptors = 4
+mqtt.listener.https.max_clients = 64
+mqtt.listener.https.handshake_timeout = 15
+mqtt.listener.https.certfile = etc/certs/cert.pem
+mqtt.listener.https.keyfile = etc/certs/key.pem
 ## mqtt.listener.https.cacertfile = etc/certs/cacert.pem
 ## mqtt.listener.https.verify = verify_peer
 ## mqtt.listener.https.fail_if_no_peer_cert = true
diff --git a/priv/emq.schema b/priv/emq.schema
index 2c73482ed..12113f14b 100644
--- a/priv/emq.schema
+++ b/priv/emq.schema
@@ -22,6 +22,19 @@
   hidden
 ]}.
 
+%% @doc http://erlang.org/doc/man/heart.html
+{mapping, "node.heartbeat", "vm_args.-heart", [
+  {datatype, flag},
+  hidden
+]}.
+
+{translation, "vm_args.-heart", fun(Conf) ->
+    case cuttlefish:conf_get("node.heartbeat", Conf) of
+        true  -> "";
+        false -> cuttlefish:invalid("should be 'on' or comment the line!")
+    end
+end}.
+
 %% @doc Enable Kernel Poll
 {mapping, "node.kernel_poll", "vm_args.+K", [
   {default, on},
@@ -338,7 +351,7 @@ end}.
 %% @doc Max queue length. Enqueued messages when persistent client disconnected, or inflight window is full.
 {mapping, "mqtt.queue.max_length", "emqttd.queue", [
   {default, infinity},
-  {datatype, [atom, integer]}
+  {datatype, [integer, {atom, infinity}]}
 ]}.
 
 %% @doc Low-water mark of queued messages