diff --git a/README.md b/README.md
index ca09f11..6906221 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,6 @@ This is a sample implementation of the "Monkey" programming language
 interpreter as outlined in the book "Writing an interpreter in Go" by Thorsten
 Ball.
 
+This implementation contains some custom additions and flavors like "Maybe" instead of null.
+
 The main program runs the REPL.