diff --git a/web-mobile-programming/web-mobile-programming.md b/web-mobile-programming/web-mobile-programming.md
index 633f476..2be7380 100644
--- a/web-mobile-programming/web-mobile-programming.md
+++ b/web-mobile-programming/web-mobile-programming.md
@@ -81,5 +81,5 @@ _The correct answers are highlighted in bold_
 16. Which group of HTTP status codes indicate an error occured on the client?
 	- 1xx
 	- 2xx
-	- 4xx
+	- **4xx**
 	- 5xx