Document which part of the random module module are guaranteed.
diff --git a/Misc/NEWS b/Misc/NEWS
index 262983b..014164e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -13,6 +13,11 @@
 Library
 -------
 
+- Updates to the random module:
+
+  * Document which parts of the module are guaranteed to stay the same
+    across versions and which parts are subject to change.
+
 - collections.OrderedDict now supports a new method for repositioning
   keys to either end.