README.markdown in extend_at-0.1.0 vs README.markdown in extend_at-0.1.1

@@ -1,8 +1,12 @@
 # Extend at
 
 This gem allows you to extend models without migrations: This way you can, i.e., develop your own content types, like in Drupal.
 
+## NOTE:
+
+Incompatible with previous versions.
+
 ## Installation
 
 <code>gem install extend_at</code>
 
 ### Rails 3
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