@xref{Face Attributes}.
@item
-A list, where each element uses one of the two forms listed above.
+A list of faces. This specifies a face which is an aggregate of the
+attributes of each of the listed faces. Faces occurring earlier in
+the list have higher priority. Each list element must have one of the
+two above forms (i.e.@: either a face name or a property list of face
+attributes).
@end itemize
Font Lock mode (@pxref{Font Lock Mode}) works in most buffers by