Use correct directive to document one method
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 6c9b1e5..39a03dd 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -83,7 +83,7 @@
creating subcontexts that can be updated without altering values in any
of the parent mappings.
- .. attribute:: parents()
+ .. method:: parents()
Returns a new :class:`ChainMap` containing all of the maps in the current
instance except the first one. This is useful for skipping the first map