diff --git a/WHATSNEW.txt b/WHATSNEW.txt
index 3bd8eeb..d9d3144 100644
--- a/WHATSNEW.txt
+++ b/WHATSNEW.txt
@@ -6,6 +6,21 @@
 
 CHANGES
 
+
+- More and better validation is done of parameters passed to
+  the parsing API:
+
+    In addition to the initial symbol table, the passed
+    template table is also checked.
+
+    The initial value for each passed symbol is checked for 
+    valid type in both the symbol table and the template table passed
+    to the API.
+
+    Template names are checked to make sure they do not contain 
+    namespace separators.  Templates must be named canonically.
+    This was previously the case, but not checked.
+
 - The program changes described below have made the 'ParseConfig'
   API incompatible with previous versions of 'tconfpy'.  The version
   number has been branched to 2.x to reflect this fact.  Existing