diff --git a/manual/cops_style.md b/manual/cops_style.md
index d697991964f..a7ebadfc770 100644
--- a/manual/cops_style.md
+++ b/manual/cops_style.md
@@ -2813,6 +2813,10 @@ EnforcedStyle | separated
 SupportedStyles | separated, grouped
 
 
+### References
+
+* [https://github.com/bbatsov/ruby-style-guide#mixin-grouping](https://github.com/bbatsov/ruby-style-guide#mixin-grouping)
+
 ## Style/ModuleFunction
 
 Enabled by default | Supports autocorrection