diff --git a/mrbgems/mruby-set/README.md b/mrbgems/mruby-set/README.md
index 2ce6fba89..d3ea38a4f 100644
--- a/mrbgems/mruby-set/README.md
+++ b/mrbgems/mruby-set/README.md
@@ -1,20 +1,7 @@
-# mruby-set   [![Build Status](https://travis-ci.org/yui-knk/mruby-set.png?branch=master)](https://travis-ci.org/yui-knk/mruby-set)
+# mruby-set
 
 Set class
 
-## Install by mrbgems
-
-- add conf.gem line to `build_config.rb`
-
-```ruby
-MRuby::Build.new do |conf|
-
-  # ... (snip) ...
-
-  conf.gem :git => 'https://github.com/yui-knk/mruby-set.git'
-end
-```
-
 ## Example
 
 ```ruby