Fix markup.

diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 5d68e5a3f64cd9f734ff90ece652dfa871e856a6..ce47bd0072649585999cbddb24000d7e8a55ec9f 100644 (file)
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -717,7 +717,7 @@ field names, the method and attribute names start with an underscore.
       >>> p._asdict()
       OrderedDict([('x', 11), ('y', 22)])
 
-   .. versionchanged 3.1
+   .. versionchanged:: 3.1
       Returns an :class:`OrderedDict` instead of a regular :class:`dict`.
 
 .. method:: somenamedtuple._replace(kwargs)