diff --git a/README.md b/README.md
index a5e2258..c6697f9 100644
--- a/README.md
+++ b/README.md
@@ -11,4 +11,6 @@ A version of the Lisp programming language for boards based on the ARM processor
 * Maxim MAX32620FTHR.
 * Teensy 4.0/4.1.
 
+The "-comments" version is identical but includes comprehensive comments.
+
 For more information see: http://www.ulisp.com/