diff --git a/27_Ref/27_ref.md b/27_Ref/27_ref.md
index e7c8b14..421a00f 100644
--- a/27_Ref/27_ref.md
+++ b/27_Ref/27_ref.md
@@ -137,7 +137,7 @@ ReactDOM.render(<App />, rootElement
 
 # Exercises
 
-1. Coming...
+1. Develop the following [application](https://www.30daysofreact.com/day-27/hexadecimal-colors). The application generates 27 hexadecimal colors by default. If the generate button get clicked it will generate another new 27 hexadecimal colors.
 
 🎉 CONGRATULATIONS ! 🎉