diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index bc03685..cee152b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -9,7 +9,6 @@
   * [Environment](#environment)
   * [Your First Contribution](#your-first-contribution)
   * [Contribution Targets](#contribution-targets)
-- [Rules](#rules)
 - [License](#license)
 - [References](#references)
 
diff --git a/docs/README.md b/docs/README.md
index 1430e4b..639291b 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -8,11 +8,11 @@
   * [Project Structure](#project-structure)
   * [Rules](#rules)
 - [User Custom CSS](#user-custom-css)
+  * [Basics](#basics-1)
   * [Restrictions](#restrictions)
 
 <!-- markdown-toc end -->
 
-
 ## Basics
 The following documents may be helpful:
 - [Roadmap](https://github.com/black7375/Firefox-UI-Fix/issues/2)
@@ -20,16 +20,6 @@ The following documents may be helpful:
 - [Wiki:Compatibility Issues Solution](https://github.com/black7375/Firefox-UI-Fix/wiki/Compatibility-Issues-Solution)
 - [Wiki:Tips](https://github.com/black7375/Firefox-UI-Fix/wiki/Tips)
 
-CSS, SASS Documents:
-- [CSS](https://developer.mozilla.org/en-US/docs/Web/CSS)
-- [SASS(SCSS)](https://sass-lang.com/documentation)
-- [SASS Live Compile](https://www.sassmeister.com/)
-
-Live Debugging:
-- [Tutorial: How to create and live-debug userChrome.css](https://www.reddit.com/r/FirefoxCSS/comments/73dvty/tutorial_how_to_create_and_livedebug_userchromecss/)
-- [Browser Toolbox](https://developer.mozilla.org/en-US/docs/Tools/Browser_Toolbox)
-- [Style Editor](https://developer.mozilla.org/en-US/docs/Tools/Style_Editor)
-
 Firefox Source Code:
 - [Github](https://github.com/mozilla/gecko-dev)
 - [Searchfox](https://searchfox.org/)
@@ -48,5 +38,16 @@ This is a rough guideline. (Not forced)
 - [Rules.md](./Rules.md).
 
 ## User Custom CSS
+### Basics
+CSS, SASS Documents:
+- [CSS](https://developer.mozilla.org/en-US/docs/Web/CSS)
+- [SASS(SCSS)](https://sass-lang.com/documentation)
+- [SASS Live Compile](https://www.sassmeister.com/)
+
+Live Debugging:
+- [Tutorial: How to create and live-debug userChrome.css](https://www.reddit.com/r/FirefoxCSS/comments/73dvty/tutorial_how_to_create_and_livedebug_userchromecss/)
+- [Browser Toolbox](https://developer.mozilla.org/en-US/docs/Tools/Browser_Toolbox)
+- [Style Editor](https://developer.mozilla.org/en-US/docs/Tools/Style_Editor)
+
 ### Restrictions
 - [Restrictions.md](./Restrictions.md).