diff --git a/CUSTOMIZE.md b/CUSTOMIZE.md
index 64ce883..a41bf0d 100644
--- a/CUSTOMIZE.md
+++ b/CUSTOMIZE.md
@@ -31,6 +31,11 @@ Here we will give you some tips on how to customize the website. One important t
   - [Adding Collections](#adding-collections)
     - [Creating a new collection](#creating-a-new-collection)
     - [Using frontmatter fields in your collection](#using-frontmatter-fields-in-your-collection)
+    - [Creating a teachings collection](#creating-a-teachings-collection)
+      - [Course file format](#course-file-format)
+      - [Important course collection notes](#important-course-collection-notes)
+      - [Required fields](#required-fields)
+      - [Optional fields](#optional-fields)
     - [Collections with categories and tags](#collections-with-categories-and-tags)
   - [Adding a new publication](#adding-a-new-publication)
     - [Author annotation](#author-annotation)