Fixed issue #4533: File read operation was dreadfully slow
diff --git a/Misc/NEWS b/Misc/NEWS
index 87af173..3dd58e6 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,10 @@
 Core and Builtins
 -----------------
 
+- Issue #4533: File read operation was dreadfully slow due to a slowly
+  growing read buffer. Fixed by using the same growth rate algorithm as
+  Python 2.x.
+
 
 Library
 -------