diff --git a/SC3018.md b/SC3018.md
index 03c9477..477c566 100644
--- a/SC3018.md
+++ b/SC3018.md
@@ -1,4 +1,4 @@
-## In POSIX sh, ++ is undefined.
+## In POSIX sh, `++` is undefined.
 
 (or "In dash, ... is not supported." when using `dash`)