diff --git a/Misc/NEWS b/Misc/NEWS
index f34cb91..685033c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -256,6 +256,10 @@
 Extension Modules
 -----------------
 
+- Issue #4751: hashlib now releases the GIL when hashing large buffers
+  (with a hardwired threshold of 2048 bytes), allowing better parallelization
+  on multi-CPU systems. Contributed by Lukas Lueg (ebfe) and Victor Stinner.
+
 - Issue #4051: Prevent conflict of UNICODE macros in cPickle.
 
 - Issue #4738: Each zlib object now has a separate lock, allowing to compress