diff --git a/apps/emqx_slow_subs/README.md b/apps/emqx_slow_subs/README.md
index cfc87f775..8b83508c2 100644
--- a/apps/emqx_slow_subs/README.md
+++ b/apps/emqx_slow_subs/README.md
@@ -43,5 +43,5 @@ Default value: 10
 
 Default value: whole
 
-# Contributing - [Mandatory]
+# Contributing
 Please see our [contributing.md](../../CONTRIBUTING.md).