Fix typo.
diff --git a/Doc/library/gzip.rst b/Doc/library/gzip.rst
index 8a7c928..57093e5 100644
--- a/Doc/library/gzip.rst
+++ b/Doc/library/gzip.rst
@@ -67,7 +67,7 @@
object.
When *fileobj* is not ``None``, the *filename* argument is only used to be
- included in the :program:`gzip` file header, which may includes the original
+ included in the :program:`gzip` file header, which may include the original
filename of the uncompressed file. It defaults to the filename of *fileobj*, if
discernible; otherwise, it defaults to the empty string, and in this case the
original filename is not included in the header.