diff --git a/SC3015.md b/SC3015.md
index 39dc42e..f2d4874 100644
--- a/SC3015.md
+++ b/SC3015.md
@@ -3,12 +3,14 @@
 ### Problematic code:
 
 ```sh
+#!/bin/sh
 [ "$var" =~ .*foo[0-9]* ]
 ```
 
 ### Correct code:
 
 ```sh
+#!/bin/sh
 expr "$var" : ".*foo[0-9]*" > /dev/null
 ```