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-rw-r--r--Doc/library/zlib.rst1
1 files changed, 1 insertions, 0 deletions
diff --git a/Doc/library/zlib.rst b/Doc/library/zlib.rst
index 565f3f7211..b7ca558932 100644
--- a/Doc/library/zlib.rst
+++ b/Doc/library/zlib.rst
@@ -142,6 +142,7 @@ The available exception and functions in this module are:
must include a zlib header and trailer.
* 0: Automatically determine the window size from the zlib header.
+ Only supported since zlib 1.2.3.5.
* −8 to −15: Uses the absolute value of *wbits* as the window size
logarithm. The input must be a raw stream with no header or trailer.