diff --git a/docs/manifest-format.txt b/docs/manifest-format.txt
index 9f4585b..a827f55 100644
--- a/docs/manifest-format.txt
+++ b/docs/manifest-format.txt
@@ -171,7 +171,11 @@
 
 Attribute `groups`: List of groups to which this project belongs,
 whitespace or comma separated.  All projects belong to the group
-"default".
+"default", and each project automatically belongs to a group of
+it's name:`name` and path:`path`.  E.g. for
+<project name="monkeys" path="barrel-of"/>, that project
+definition is implicitly in the following manifest groups:
+default, name:monkeys, and path:barrel-of.
 
 Element annotation
 ------------------