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index dd38e4f..0decc17 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,10 @@
 # AppleIIGo
 Apple //e emulator Java applet
 
-Original version: Copyright 2006 Marc S. Ressl
+Original version: Copyright 2006 Marc S. Ressl, with parts adapted from code by
+- Steven E. Hugg
+- Doug Kwan
+- Randy Frank
+- Ben Koning
 
 Subsequent versions: Copyright 2008-2015 Nick Westgate