diff --git a/SC2101.md b/SC2101.md
index f0c1d60..145b57d 100644
--- a/SC2101.md
+++ b/SC2101.md
@@ -1,4 +1,4 @@
-# Named class needs outer `[]`, e.g. `[[:digit:]]`.
+## Named class needs outer `[]`, e.g. `[[:digit:]]`.
 
 ### Problematic code: