diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 99841395..053ad64e 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -98,6 +98,8 @@ Adding sections or subcategories is maintainer-only (see Admission). For maintai
 3. Add the section title to the Table of Contents under its group
 4. Order entries per Entry Ordering above
 
+Name a section's catch-all subcategory General, never the section's own name: a subcategory named like its section competes with the section page in search results.
+
 ## Review Process
 
 PRs are reviewed by automated tools and maintainers: