diff --git a/radicale/rights/__init__.py b/radicale/rights/__init__.py
index bf76158..31a7477 100644
--- a/radicale/rights/__init__.py
+++ b/radicale/rights/__init__.py
@@ -21,10 +21,10 @@ collections and entries.
 
 Permissions:
 
-  - R: read a collection
-  - r: read an address book or calendar entry
-  - W: write a collection
-  - w: read an address book or calendar entry
+  - R: read a collection (excluding address book or calendar collections)
+  - r: read an address book or calendar collection
+  - W: write a collection (excluding address book or calendar collections)
+  - w: write an address book or calendar collection
 
 Take a look at the class ``BaseRights`` if you want to implement your own.