diff --git a/Misc/NEWS b/Misc/NEWS
index b517b97..a5ea3be 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -364,6 +364,11 @@
 Library
 -------
 
+- Issue #6838: Use a list to accumulate the value instead of
+  repeatedly concatenating strings in httplib's
+  HTTPResponse._read_chunked providing a significant speed increase
+  when downloading large files servend with a Transfer-Encoding of 'chunked'.
+
 - Issue #5275: In Cookie's Cookie.load(), properly handle non-string arguments
   as documented.