diff --git a/SC2320.md b/SC2320.md
index 09bd5d1..07f99b9 100644
--- a/SC2320.md
+++ b/SC2320.md
@@ -1,4 +1,4 @@
-## This $? refers to echo/printf, not a previous command. Assign to variable to avoid it being overwritten.
+## This `$?` refers to echo/printf, not a previous command. Assign to variable to avoid it being overwritten.
 
 ### Problematic code: