Updating readme.

tinchi · Jul 26, 2013 · 195d174 · 195d174
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diff --git a/README.md b/README.md
@@ -9,6 +9,8 @@ Mongoid Counter Cache is a simple mongoid extension to add basic counter cache f
 
 ## INSTALLATION
 
+#### Mongoid Magic Counter Cache requires ruby `1.9.3` at a minimum
+
 ### RubyGems
 ````sh
 $ [sudo] gem install mongoid_magic_counter_cache