diff --git a/radicale/rights/__init__.py b/radicale/rights/__init__.py
index 7aec9d4e..ad5ff9b6 100644
--- a/radicale/rights/__init__.py
+++ b/radicale/rights/__init__.py
@@ -27,6 +27,10 @@ Permissions:
        (CalDAV/CardDAV is susceptible to expensive search requests)
   - W: write collections (excluding address books and calendars)
   - w: write address book and calendar collections
+  - D: allow deleting a collection in case permit_delete_collection=False (>= 3.3.0)
+  - d: deny deleting a collection in case permit_delete_collection=True (>= 3.3.0)
+  - O: allow overwriting a collection in case permit_overwrite_collection=False (>= 3.3.0)
+  - o: deny overwriting a collection in case permit_overwrite_collection=True (>= 3.3.0)
 
 Take a look at the class ``BaseRights`` if you want to implement your own.