diff --git a/README.md b/README.md
index 7559eda..7451cc3 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 txexpr
 ---------------
 
-Convenience functions for working with HTML-style tagged X-expressions in Racket
+Convenience functions for working with HTML-style tagged X-expressions in Racket 6.0+
 
 Install from the command line like so: