diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine.app.src b/apps/emqx_rule_engine/src/emqx_rule_engine.app.src
index ae8e29593..c353742ae 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine.app.src
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine.app.src
@@ -2,7 +2,7 @@
 {application, emqx_rule_engine, [
     {description, "EMQX Rule Engine"},
     % strict semver, bump manually!
-    {vsn, "5.0.27"},
+    {vsn, "5.0.28"},
     {modules, []},
     {registered, [emqx_rule_engine_sup, emqx_rule_engine]},
     {applications, [kernel, stdlib, rulesql, getopt, emqx_ctl, uuid]},
diff --git a/apps/emqx_rule_engine/src/emqx_rule_funcs.erl b/apps/emqx_rule_engine/src/emqx_rule_funcs.erl
index 37797cb4f..aa5e271eb 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_funcs.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_funcs.erl
@@ -80,14 +80,18 @@
     tanh/1
 ]).
 
-%% Bits Funcs
+%% Bitwise operations
 -export([
     bitnot/1,
     bitand/2,
     bitor/2,
     bitxor/2,
     bitsl/2,
-    bitsr/2,
+    bitsr/2
+]).
+
+%% binary and bitstring Funcs
+-export([
     bitsize/1,
     bytesize/1,
     subbits/2,