diff --git a/subjects/printreversealphabet.en.md b/subjects/printreversealphabet.en.md
index ad2f61b01..eb388f48a 100644
--- a/subjects/printreversealphabet.en.md
+++ b/subjects/printreversealphabet.en.md
@@ -6,6 +6,8 @@ Write a [program](TODO-LINK) that prints the Latin alphabet in lowercase in reve
 
 A line is a sequence of characters preceding the [end of line](https://en.wikipedia.org/wiki/Newline) character (`'\n'`).
 
+Please note that casting is not allowed for this exercise!
+
 ### Usage
 
 ```console