Finish that thought.

src/zope/interface/adapter.py

@@ -76,7 +76,7 @@ class BaseAdapterRegistry(object):
       This is the type used for the ``_provided`` mapping.
       This is separate from the generic mapping type because the values
       are always integers, so one might choose to use a more optimized data
-      structure such as a ``OIBTree``. The same caveats apply as for
+      structure such as a ``OIBTree``. The same caveats apply as for ``_mappingType``.
 
 
     .. versionchanged:: 5.3.0