Issue 3116: fix quadratic behavior in marshal.dumps().
diff --git a/Misc/NEWS b/Misc/NEWS
index eeeaab0..cd44835 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -50,6 +50,8 @@
 Extension Modules
 -----------------
 
+- Issue #3116:  marshal.dumps() had quadratic behavior for strings > 32Mb.
+
 - Issue #2138: Add factorial() the math module.
 
 - The heapq module does comparisons using LT instead of LE.  This