diff --git a/Rakefile b/Rakefile
index 7243a1ab..cce83084 100644
--- a/Rakefile
+++ b/Rakefile
@@ -62,6 +62,7 @@ spec = Gem::Specification.new do |s|
 
   # If your tests use any gems, include them here
   s.add_development_dependency("rr")
+  s.add_development_dependency("yard")
 end
 
 # This task actually builds the gem. We also regenerate a static