one more typo

diff --git a/doc/build/reference/ext/associationproxy.rst b/doc/build/reference/ext/associationproxy.rst
index b6604a6c41ddb4c31bead77d62a90acac09d4e79..37cee21799798ab8630f023830437b6e1a2a2788 100644 (file)
--- a/doc/build/reference/ext/associationproxy.rst
+++ b/doc/build/reference/ext/associationproxy.rst
@@ -112,7 +112,7 @@ Above, the ``Keyword.__init__`` takes a single argument ``keyword``, which
 maps conveniently to the value being set through the proxy.  A ``creator``
 function could have been used instead if more flexibility was required.
 
-Because the proxies are backed a regular relation collection, all of the
+Because the proxies are backed by a regular relation collection, all of the
 usual hooks and patterns for using collections are still in effect.  The
 most convenient behavior is the automatic setting of "parent"-type
 relationships on assignment.  In the example above, nothing special had to