diff --git a/challenges/01-responsive-web-design/basic-css.json b/challenges/01-responsive-web-design/basic-css.json
index 538ab9b808..11555cb61b 100644
--- a/challenges/01-responsive-web-design/basic-css.json
+++ b/challenges/01-responsive-web-design/basic-css.json
@@ -11,7 +11,7 @@
         [
           "",
           "",
-          "Cascading Style Sheets (CSS) tell the browser how to display the text and other content that you write in HTML.",
+          "Cascading Style Sheets (CSS) tell the browser how to display the text and other content that you write in HTML.<br><br>Note that CSS is case-sensitive so be careful with your capitalization.",
           ""
         ],
         [