--- a/NEWS
+++ b/NEWS
@@ -47,6 +47,9 @@
   to be observed after construction. The change guarentees that
   observed StochasticNodes have the same value across all chains. The
   Compiler has been modified to use the new StochasticNode API.
+* Nodes now have a unique index which is defined when they are inserted
+  into a model. The indices define a unique and reproducible ordering
+  which is also a topological ordering. 
 
 Internal changes in modules
 ===========================