Issue #23200: Document that max_length=0 is not supported
diff --git a/Doc/library/zlib.rst b/Doc/library/zlib.rst
index 70e1483..96e723b 100644
--- a/Doc/library/zlib.rst
+++ b/Doc/library/zlib.rst
@@ -221,7 +221,7 @@
:meth:`decompress` method. Some of the input data may be preserved in internal
buffers for later processing.
- If the optional parameter *max_length* is supplied then the return value will be
+ If the optional parameter *max_length* is non-zero then the return value will be
no longer than *max_length*. This may mean that not all of the compressed input
can be processed; and unconsumed data will be stored in the attribute
:attr:`unconsumed_tail`. This string must be passed to a subsequent call to