diff --git a/SC3006.md b/SC3006.md
index 4b8aed5..c2941c6 100644
--- a/SC3006.md
+++ b/SC3006.md
@@ -1,4 +1,4 @@
-## In POSIX sh, standalone ((..)) is undefined.
+## In POSIX sh, standalone `((..))` is undefined.
 
 ### Problematic code: