diff --git a/.rspec b/.rspec
new file mode 100644
index 0000000..5f16476
--- /dev/null
+++ b/.rspec
@@ -0,0 +1,2 @@
+--color
+--format progress
diff --git a/exec.rb b/exec.rb
index 0e59aba..1f79b70 100644
--- a/exec.rb
+++ b/exec.rb
@@ -3,5 +3,5 @@
 fizzbuzz = Fizzbuzz.new
 
 (1..100).each do |number|
-  puts fizzbuzz.calculate number
+  puts "#{number}: #{fizzbuzz.calculate(number)}"
 end
diff --git a/lib/fizzbuzz.rb b/lib/fizzbuzz.rb
index 4746a88..f9a304d 100644
--- a/lib/fizzbuzz.rb
+++ b/lib/fizzbuzz.rb
@@ -1,6 +1,8 @@
 class Fizzbuzz
   def calculate number
-    if number % 3 == 0 && number % 5 == 0
+    if number.to_s.include? '7'
+      'GitHub'
+    elsif number % 3 == 0 && number % 5 == 0
       'fizzbuzz'
     elsif number % 3 == 0
       'fizz'
diff --git a/spec/fizzbuzz_spec.rb b/spec/fizzbuzz_spec.rb
index 93a63e6..84e32ac 100644
--- a/spec/fizzbuzz_spec.rb
+++ b/spec/fizzbuzz_spec.rb
@@ -20,4 +20,11 @@
     it { subject.calculate(15).should eq 'fizzbuzz' }
     it { subject.calculate(30).should eq 'fizzbuzz' }
   end
+
+  context 'GitHub number' do
+    it { subject.calculate(77).should eq 'GitHub' }
+    it { subject.calculate(17).should eq 'GitHub' }
+    it { subject.calculate(27).should eq 'GitHub' }
+    it { subject.calculate(75).should eq 'GitHub' }
+  end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..dbc4f1a
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,17 @@
+# This file was generated by the `rspec --init` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# Require this file using `require "spec_helper"` to ensure that it is only
+# loaded once.
+#
+# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  config.treat_symbols_as_metadata_keys_with_true_values = true
+  config.run_all_when_everything_filtered = true
+  config.filter_run :focus
+
+  # Run specs in random order to surface order dependencies. If you find an
+  # order dependency and want to debug it, you can fix the order by providing
+  # the seed, which is printed after each run.
+  #     --seed 1234
+  config.order = 'random'
+end
diff --git a/test.html b/test.html
new file mode 100644
index 0000000..64787ac
--- /dev/null
+++ b/test.html
@@ -0,0 +1 @@
+プルリクtest用html追加
\ No newline at end of file