Improve the grammar of a non-sentence.
diff --git a/Doc/library/queue.rst b/Doc/library/queue.rst
index 26336ef..bc35dfe 100644
--- a/Doc/library/queue.rst
+++ b/Doc/library/queue.rst
@@ -15,8 +15,8 @@
availability of thread support in Python; see the :mod:`threading`
module.
-Implements three types of queue whose only difference is the order that
-the entries are retrieved. In a FIFO queue, the first tasks added are
+The module implements three types of queue, which differ only in the order in
+which the entries are retrieved. In a FIFO queue, the first tasks added are
the first retrieved. In a LIFO queue, the most recently added entry is
the first retrieved (operating like a stack). With a priority queue,
the entries are kept sorted (using the :mod:`heapq` module) and the