diff --git a/README.md b/README.md
index 5431bf8..bf19957 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,9 @@ the code a bit to sustain 60fps.
 
 ## Compiling and running the code
 
-You will need Racket version 7.6 or later.
+You will need Racket version 7.6 or later. (If you're using Racket CS,
+you'll need version 7.8 or later because of
+[this issue](https://github.com/racket/racket/issues/3132).)
 
 Once you have Racket installed, run