diff --git a/SC3009.md b/SC3009.md
index 1811309..974067f 100644
--- a/SC3009.md
+++ b/SC3009.md
@@ -1,4 +1,4 @@
-In POSIX `sh`, brace expansion is undefined.
+**In POSIX `sh`, brace expansion is undefined.**
 
 Problematic code:
 ```