diff --git a/apps/emqx_web_hook/src/emqx_web_hook_actions.erl b/apps/emqx_web_hook/src/emqx_web_hook_actions.erl
index ae68e79e1..67826fc9c 100644
--- a/apps/emqx_web_hook/src/emqx_web_hook_actions.erl
+++ b/apps/emqx_web_hook/src/emqx_web_hook_actions.erl
@@ -67,6 +67,8 @@
                    description => #{en => <<"Connection Pool">>,
                                     zh => <<"连接池大小"/utf8>>}
                 },
+    %% NOTE: In the new version `enable_pipelining` is changed to integer type
+    %% but it needs to be compatible with the old version, so here keep it as boolean
     enable_pipelining => #{order => 5,
                            type => boolean,
                            default => true,