README.md in gemirro-0.11.0 vs README.md in gemirro-0.12.0

@@ -6,9 +6,10 @@
 
 ## Requirements
 
 * Ruby 1.9.2 or newer
 * Enough space to store Gems
+* A recent version of Rubygems (`gem update --system`)
 
 ## Installation
 
 Assuming RubyGems isn't down you can install the Gem as following: