Rakefile in mongoid_tree-0.3.1 vs Rakefile in mongoid_tree-0.3.2

@@ -9,9 +9,12 @@
         gem.description = %Q{Fully featured tree implementation for Mongoid using materialized paths and relative associations. Featuring Depth and Breadth first search.}
         gem.email = "[e-mail]"
         gem.homepage = "http://github.com/ticktricktrack/mongoid_tree"
         gem.authors = ["Rainer Kuhn"]
         # gem is a Gem::Specification... see http://www.rubygems.org/read/chapter/20 for additional settings
+        
+        gem.add_runtime_dependency('mongoid', '>= 2.0.0.beta.16')
+        
     end
     Jeweler::GemcutterTasks.new
 rescue LoadError
     puts "Jeweler (or a dependency) not available. Install it with: gem install jeweler"
 end