diff --git a/doc/dev/guidelines.md b/doc/dev/guidelines.md
index 44c7b08..3a9874d 100644
--- a/doc/dev/guidelines.md
+++ b/doc/dev/guidelines.md
@@ -1,6 +1,8 @@
+# Guidelines
+
 This file contains guidelines for code development.
 
-# File structure
+## Repository structure
 
 - `assets/`: Static files (images, CSS, JS) and site templates.
 - `config/`: Handle configurations for the server.
diff --git a/doc/dev/index.md b/doc/dev/index.md
index d9b4fee..123fa88 100644
--- a/doc/dev/index.md
+++ b/doc/dev/index.md
@@ -19,11 +19,13 @@ The developer documentation is comprised of the following files:
 
 4. [Framework Migration](framework-migration.md): Documentation of the migration from gofiber to net/http. This migration was completed in [release v2.8](https://codeberg.org/VnPower/PixivFE/src/tag/v2.8) (commit [1ac6f40b57](https://codeberg.org/VnPower/PixivFE/src/commit/1ac6f40b57608b1576d9e812698e95958c91c626)).
 
-5. [Helpful Resources](helpful-resources.md): External links to materials and resources that can aid in PixivFE development, including other Pixiv-related projects and tools.
+5. [Guidelines](guidelines.md): Guidelines for code development, including the repository file structure.
 
-6. [Roadmap](roadmap.md): Planned features and improvements for PixivFE, categorized by implementation status and priority.
+6. [Helpful Resources](helpful-resources.md): External links to materials and resources that can aid in PixivFE development, including other Pixiv-related projects and tools.
 
-7. [Testing](testing.md): Information about the current state of testing in PixivFE and considerations for future testing strategies.
+7. [Roadmap](roadmap.md): Planned features and improvements for PixivFE, categorized by implementation status and priority.
+
+8. [Testing](testing.md): Information about the current state of testing in PixivFE and considerations for future testing strategies.
 
 ## Features in Development
 
diff --git a/mkdocs.yml b/mkdocs.yml
index 34236c5..e2142a8 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -19,6 +19,7 @@ nav:
     - "Coding tips": "dev/coding-tips.md"
     - "Design flaws": "dev/design-flaws.md"
     - "Feature ideas": "dev/feature-ideas.md"
+    - "Guidelines": "dev/guidelines.md"
     - "Helpful resources": "dev/helpful-resources.md"
     - "Roadmap": "dev/roadmap.md"
     - "Testing": "dev/testing.md"