Issue #1675951: Allow GzipFile to work with unseekable file objects.
Patch by Florian Festi.
diff --git a/Doc/library/gzip.rst b/Doc/library/gzip.rst
index edd5587..934fcb3 100644
--- a/Doc/library/gzip.rst
+++ b/Doc/library/gzip.rst
@@ -74,6 +74,9 @@
    .. versionchanged:: 3.2
       Support for zero-padded files was added.
 
+   .. versionchanged:: 3.2
+      Support for unseekable files was added.
+
 
 .. function:: open(filename, mode='rb', compresslevel=9)