diff --git a/wolverine.gemspec b/wolverine.gemspec
index 6db8a5d..39e69b0 100644
--- a/wolverine.gemspec
+++ b/wolverine.gemspec
@@ -19,7 +19,9 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_runtime_dependency 'redis'
+
   s.add_development_dependency 'mocha'
   s.add_development_dependency 'minitest'
   s.add_development_dependency 'rake'
+  s.add_development_dependency 'yard'
 end