diff --git a/doc/README.md b/doc/README.md
index 18806bbf..0bb8ec7a 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -5,6 +5,6 @@ Showing incompatibilities against [Haml](https://github.com/haml/haml) and [Faml
 
 ## engine
 
-- [engine/old\_attributes\_spec.rb](https://github.com/k0kubun/hamlit/blob/master/doc/engine/old_attributes.md)
-- [engine/script\_spec.rb](https://github.com/k0kubun/hamlit/blob/master/doc/engine/script.md)
-- [engine/text\_spec.rb](https://github.com/k0kubun/hamlit/blob/master/doc/engine/text.md)
+- [engine/old\_attributes\_spec.rb](engine/old_attributes.md)
+- [engine/script\_spec.rb](engine/script.md)
+- [engine/text\_spec.rb](engine/text.md)
diff --git a/doc/engine/old_attributes.md b/doc/engine/old_attributes.md
index 0d25b6fc..3a7bbf02 100644
--- a/doc/engine/old_attributes.md
+++ b/doc/engine/old_attributes.md
@@ -1,4 +1,4 @@
-# [old\_attributes\_spec.rb:43](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/engine/old_attributes_spec.rb#L43)
+# [old\_attributes\_spec.rb:43](/spec/hamlit/engine/old_attributes_spec.rb#L43)
 ## Input
 ```haml
 %span{ class: '}}}', id: '{}}' } }{
@@ -26,7 +26,7 @@ Faml::Compiler::UnparsableRubyCode: Unparsable Ruby code is given to attributes:
 ```
 
 
-# [old\_attributes\_spec.rb:201](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/engine/old_attributes_spec.rb#L201)
+# [old\_attributes\_spec.rb:201](/spec/hamlit/engine/old_attributes_spec.rb#L201)
 ## Input
 ```haml
 / wontfix: Non-boolean attributes are not escaped for optimization.
diff --git a/doc/engine/script.md b/doc/engine/script.md
index 8a38b84f..2747ef8e 100644
--- a/doc/engine/script.md
+++ b/doc/engine/script.md
@@ -1,4 +1,4 @@
-# [script\_spec.rb:41](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/engine/script_spec.rb#L41)
+# [script\_spec.rb:41](/spec/hamlit/engine/script_spec.rb#L41)
 ## Input
 ```haml
 = 3.times do |i|
@@ -28,7 +28,7 @@
 ```
 
 
-# [script\_spec.rb:55](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/engine/script_spec.rb#L55)
+# [script\_spec.rb:55](/spec/hamlit/engine/script_spec.rb#L55)
 ## Input
 ```haml
 %span
@@ -56,7 +56,7 @@
 ```
 
 
-# [script\_spec.rb:87](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/engine/script_spec.rb#L87)
+# [script\_spec.rb:87](/spec/hamlit/engine/script_spec.rb#L87)
 ## Input
 ```haml
 != '<"&>'
@@ -80,7 +80,7 @@
 ```
 
 
-# [script\_spec.rb:98](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/engine/script_spec.rb#L98)
+# [script\_spec.rb:98](/spec/hamlit/engine/script_spec.rb#L98)
 ## Input
 ```haml
 &= '<"&>'
diff --git a/doc/engine/text.md b/doc/engine/text.md
index 29cd85aa..98228f2d 100644
--- a/doc/engine/text.md
+++ b/doc/engine/text.md
@@ -1,4 +1,4 @@
-# [text\_spec.rb:15](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/engine/text_spec.rb#L15)
+# [text\_spec.rb:15](/spec/hamlit/engine/text_spec.rb#L15)
 ## Input
 ```haml
 .
@@ -33,7 +33,7 @@ Haml::SyntaxError: Illegal element: classes and ids must have values.
 ```
 
 
-# [text\_spec.rb:99](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/engine/text_spec.rb#L99)
+# [text\_spec.rb:99](/spec/hamlit/engine/text_spec.rb#L99)
 ## Input
 ```haml
 &nbsp;
@@ -63,7 +63,7 @@ hello
 ```
 
 
-# [text\_spec.rb:175](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/engine/text_spec.rb#L175)
+# [text\_spec.rb:175](/spec/hamlit/engine/text_spec.rb#L175)
 ## Input
 ```haml
 1#{2
diff --git a/doc/filters/coffee.md b/doc/filters/coffee.md
index bff80c9e..14bfb596 100644
--- a/doc/filters/coffee.md
+++ b/doc/filters/coffee.md
@@ -1,4 +1,4 @@
-# [coffee\_spec.rb:3](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/coffee_spec.rb#L3)
+# [coffee\_spec.rb:3](/spec/hamlit/filters/coffee_spec.rb#L3)
 ## Input
 ```haml
 :coffee
@@ -40,7 +40,7 @@
 ```
 
 
-# [coffee\_spec.rb:22](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/coffee_spec.rb#L22)
+# [coffee\_spec.rb:22](/spec/hamlit/filters/coffee_spec.rb#L22)
 ## Input
 ```haml
 :coffee
@@ -82,7 +82,7 @@
 ```
 
 
-# [coffee\_spec.rb:41](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/coffee_spec.rb#L41)
+# [coffee\_spec.rb:41](/spec/hamlit/filters/coffee_spec.rb#L41)
 ## Input
 ```haml
 :coffee
diff --git a/doc/filters/erb.md b/doc/filters/erb.md
index 76420684..20329cdb 100644
--- a/doc/filters/erb.md
+++ b/doc/filters/erb.md
@@ -1,4 +1,4 @@
-# [erb\_spec.rb:3](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/erb_spec.rb#L3)
+# [erb\_spec.rb:3](/spec/hamlit/filters/erb_spec.rb#L3)
 ## Input
 ```haml
 :erb
diff --git a/doc/filters/javascript.md b/doc/filters/javascript.md
index fd449ba8..f0b52c0d 100644
--- a/doc/filters/javascript.md
+++ b/doc/filters/javascript.md
@@ -1,4 +1,4 @@
-# [javascript\_spec.rb:3](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/javascript_spec.rb#L3)
+# [javascript\_spec.rb:3](/spec/hamlit/filters/javascript_spec.rb#L3)
 ## Input
 ```haml
 before
@@ -36,7 +36,7 @@ after
 ```
 
 
-# [javascript\_spec.rb:32](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/javascript_spec.rb#L32)
+# [javascript\_spec.rb:32](/spec/hamlit/filters/javascript_spec.rb#L32)
 ## Input
 ```haml
 :javascript
diff --git a/doc/filters/less.md b/doc/filters/less.md
index 3c0eac32..1dc0e54f 100644
--- a/doc/filters/less.md
+++ b/doc/filters/less.md
@@ -1,4 +1,4 @@
-# [less\_spec.rb:3](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/less_spec.rb#L3)
+# [less\_spec.rb:3](/spec/hamlit/filters/less_spec.rb#L3)
 ## Input
 ```haml
 :less
@@ -29,7 +29,7 @@ Faml::FilterCompilers::NotFound: Unable to find compiler for less
 ```
 
 
-# [less\_spec.rb:22](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/less_spec.rb#L22)
+# [less\_spec.rb:22](/spec/hamlit/filters/less_spec.rb#L22)
 ## Input
 ```haml
 :less
diff --git a/doc/filters/markdown.md b/doc/filters/markdown.md
index eb3b9f83..9d6e9d77 100644
--- a/doc/filters/markdown.md
+++ b/doc/filters/markdown.md
@@ -1,4 +1,4 @@
-# [markdown\_spec.rb:15](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/markdown_spec.rb#L15)
+# [markdown\_spec.rb:15](/spec/hamlit/filters/markdown_spec.rb#L15)
 ## Input
 ```haml
 - project = '<Hamlit>'
diff --git a/doc/filters/plain.md b/doc/filters/plain.md
index f50e57c2..42d22ec2 100644
--- a/doc/filters/plain.md
+++ b/doc/filters/plain.md
@@ -1,4 +1,4 @@
-# [plain\_spec.rb:3](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/plain_spec.rb#L3)
+# [plain\_spec.rb:3](/spec/hamlit/filters/plain_spec.rb#L3)
 ## Input
 ```haml
 :plain
diff --git a/doc/filters/sass.md b/doc/filters/sass.md
index c7fc869f..d8794d8f 100644
--- a/doc/filters/sass.md
+++ b/doc/filters/sass.md
@@ -1,4 +1,4 @@
-# [sass\_spec.rb:3](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/sass_spec.rb#L3)
+# [sass\_spec.rb:3](/spec/hamlit/filters/sass_spec.rb#L3)
 ## Input
 ```haml
 :sass
@@ -31,7 +31,7 @@
 ```
 
 
-# [sass\_spec.rb:19](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/sass_spec.rb#L19)
+# [sass\_spec.rb:19](/spec/hamlit/filters/sass_spec.rb#L19)
 ## Input
 ```haml
 :sass
diff --git a/doc/filters/scss.md b/doc/filters/scss.md
index b0cd9a6a..fb65e2cc 100644
--- a/doc/filters/scss.md
+++ b/doc/filters/scss.md
@@ -1,4 +1,4 @@
-# [scss\_spec.rb:3](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/scss_spec.rb#L3)
+# [scss\_spec.rb:3](/spec/hamlit/filters/scss_spec.rb#L3)
 ## Input
 ```haml
 :scss
@@ -34,7 +34,7 @@
 ```
 
 
-# [scss\_spec.rb:21](https://github.com/k0kubun/hamlit/blob/master/spec/hamlit/filters/scss_spec.rb#L21)
+# [scss\_spec.rb:21](/spec/hamlit/filters/scss_spec.rb#L21)
 ## Input
 ```haml
 :scss
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index f553db64..8448c8d4 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -165,8 +165,7 @@ class TestCase < Struct.new(:file, :dir, :lineno, :src_haml, :haml_html, :faml_h
         tests.group_by(&:doc_path).each do |path, tests|
           test = tests.first
           file_path = File.join(test.dir, test.file)
-          base_url  = 'https://github.com/k0kubun/hamlit/blob/master/doc/'
-          table_of_contents << "\n- [#{escape_markdown(file_path)}](#{File.join(base_url, path)})"
+          table_of_contents << "\n- [#{escape_markdown(file_path)}](#{path})"
         end
         table_of_contents << "\n"
       end
@@ -192,10 +191,10 @@ class TestCase < Struct.new(:file, :dir, :lineno, :src_haml, :haml_html, :faml_h
   end
 
   def document
-    base_url = 'https://github.com/k0kubun/hamlit/blob/master/spec/hamlit'
-    url = File.join(base_url, dir, file)
+    base_path = '/spec/hamlit'
+    path = File.join(base_path, dir, file)
     doc = <<-DOC
-# [#{escape_markdown("#{file}:#{lineno}")}](#{url}#L#{lineno})
+# [#{escape_markdown("#{file}:#{lineno}")}](#{path}#L#{lineno})
 ## Input
 ```haml
 #{src_haml}