Issue #4751: For hashlib algorithms provided by OpenSSL, the Python
GIL is now released during computation on data lengths >= 2048 bytes.
diff --git a/Doc/library/hashlib.rst b/Doc/library/hashlib.rst
index 73e6e4e..b7b1371 100644
--- a/Doc/library/hashlib.rst
+++ b/Doc/library/hashlib.rst
@@ -95,6 +95,12 @@
a single call with the concatenation of all the arguments: ``m.update(a);
m.update(b)`` is equivalent to ``m.update(a+b)``.
+ .. versionchanged:: 2.7
+
+ The Python GIL is released to allow other threads to run while
+ hash updates on data larger than 2048 bytes is taking place when
+ using hash algorithms supplied by OpenSSL.
+
.. method:: hash.digest()