diff --git a/Gemfile.lock b/Gemfile.lock
index 7426848..9d4afa3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,11 +22,12 @@ GEM
     arel (3.0.2)
     builder (3.0.0)
     cocaine (0.2.1)
+    diff-lcs (1.1.3)
     i18n (0.6.0)
     json (1.7.3)
     mime-types (1.19)
     multi_json (1.3.6)
-    paperclip (3.1.2)
+    paperclip (3.1.3)
       activemodel (>= 3.0.0)
       activerecord (>= 3.0.0)
       activesupport (>= 3.0.0)
@@ -39,6 +40,14 @@ GEM
       ruby-hmac (~> 0.4.0)
     rest-client (1.6.7)
       mime-types (>= 1.16)
+    rspec (2.11.0)
+      rspec-core (~> 2.11.0)
+      rspec-expectations (~> 2.11.0)
+      rspec-mocks (~> 2.11.0)
+    rspec-core (2.11.0)
+    rspec-expectations (2.11.1)
+      diff-lcs (~> 1.1.3)
+    rspec-mocks (2.11.1)
     ruby-hmac (0.4.0)
     tzinfo (0.3.33)
 
@@ -47,3 +56,4 @@ PLATFORMS
 
 DEPENDENCIES
   paperclip-qiniu!
+  rspec
diff --git a/README.md b/README.md
index 3630115..3b8aa67 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 storage [paperclip](https://github.com/thoughtbot/paperclip/) attachments to http://qiniutek.com
 
 example project: https://github.com/lidaobing/paperclip-qiniu-example
+
 example site: http://stark-cloud-4321.herokuapp.com/
 
 ## Usage
diff --git a/paperclip-qiniu.gemspec b/paperclip-qiniu.gemspec
index 45e49bd..be82a04 100644
--- a/paperclip-qiniu.gemspec
+++ b/paperclip-qiniu.gemspec
@@ -16,4 +16,5 @@ Gem::Specification.new do |gem|
   gem.version       = Paperclip::Qiniu::VERSION
   gem.add_dependency 'paperclip'
   gem.add_dependency 'qiniu-rs'
+  gem.add_development_dependency 'rspec'
 end