Documentation nit
diff --git a/Doc/library/functools.rst b/Doc/library/functools.rst
index 8f9528a..6dc9f0a 100644
--- a/Doc/library/functools.rst
+++ b/Doc/library/functools.rst
@@ -38,6 +38,8 @@
                return ((self.lastname.lower(), self.firstname.lower()) <
                        (other.lastname.lower(), other.firstname.lower()))
 
+   .. versionadded:: 2.7
+
 .. function:: reduce(function, iterable[, initializer])
 
    This is the same function as :func:`reduce`.  It is made available in this module