fix versionadded
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index e4ad5f4..951e19c 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -184,7 +184,7 @@
>>> c['sausage'] = 0 # counter entry with a zero count
>>> del c['sausage'] # del actually removes the entry
- .. versionadded:: 2.7
+ .. versionadded:: 3.1
Counter objects support two methods beyond those available for all
@@ -821,7 +821,7 @@
original insertion position is left unchanged. Deleting an entry and
reinserting it will move it to the end.
- .. versionadded:: 2.7
+ .. versionadded:: 3.1
The :meth:`popitem` method for ordered dictionaries returns and removes the
last added entry. The key/value pairs are returned in LIFO order.