diff --git a/SC3015.md b/SC3015.md
index c80d304..39dc42e 100644
--- a/SC3015.md
+++ b/SC3015.md
@@ -1,4 +1,4 @@
-## In POSIX sh, =~ regex matching is undefined.
+## In POSIX sh, `=~` regex matching is undefined.
 
 ### Problematic code: