diff --git a/code_style.md b/code_style.md
index 3ad0d38873..01c1f37146 100644
--- a/code_style.md
+++ b/code_style.md
@@ -151,6 +151,7 @@ General Style
   Don't set things to undefined. Reserve that value to mean "not yet set to anything."
   Boolean objects are verboten.
 - Use JSDoc
+- Use switch-case statements where there are 5 or more branches running against the same variable.
 
 ECMAScript
 ----------