diff --git a/README.md b/README.md
index 46ced88..1f6e876 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,7 @@
 **Authors:**  *Mark Stanley***,** *Alexander Brevig*
 
 
-This repository is a copy of the code found here [[Arduino Playground]](http://playground.arduino.cc/Code/Keypad).
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+This repository is a copy of the code found here [[Arduino Playground]](http://playground.arduino.cc/Code/Keypad).
+
+The source and file structure has been modified to conform to the newer `1.5r2` library specification and is not compatible with legacy IDE's.
+For these IDE's, visit the link above to grab the pre `1.0` compatible version, or download it directly here:  [[pre `1.0` version]](http://playground.arduino.cc/uploads/Code/keypad.zip).
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