diff --git a/Gemfile b/Gemfile
index 5b2f54f..abfa525 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'http://rubygems.org'
 
-gem 'rails', '3.2.13'
+gem 'rails', '~> 3.2.13'
 gem 'mongoid', '~> 3.1.4'
 
 gem 'mongoid_rails_migrations', '~> 1.0.1'
diff --git a/README.md b/README.md
index 67aec70..eac572e 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,13 @@ There is a demo available at [http://errbit-demo.herokuapp.com/](http://errbit-d
 Email: demo@errbit-demo.herokuapp.com<br/>
 Password: password
 
+# Requirement
+
+The list of requirement to install Errbit is :
+
+ * Ruby 1.9.3 or higher
+ * MongoDB 2.2.0 or higher
+
 Installation
 ------------
 
--
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