diff --git a/README.md b/README.md
index 117858a..9b883c6 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
 fizzbuzz [![Build Status](https://travis-ci.org/ituring/fizzbuzz.png)](https://travis-ci.org/ituring/fizzbuzz)
 
 本仓库供本书读者参考用，不接收任何形式的Pull Request，敬请谅解。
+
+Pull request 请到 https://github.com/ituring/first-pr 。
diff --git a/lib/fizzbuzz.rb b/lib/fizzbuzz.rb
index 717b0e7..fd41326 100644
--- a/lib/fizzbuzz.rb
+++ b/lib/fizzbuzz.rb
@@ -8,8 +8,10 @@ def calculate number
       'fizz'
     elsif number % 5 == 0
       'buzz'
+    elsif number.to_s.include? '7'
+      'GitHub'
     else
       number
     end
   end
-end
\ No newline at end of file
+end