1 files changed, 4 insertions, 0 deletions
diff --git a/CHANGELOG b/CHANGELOG
index 00b38153b..c8c9db2f2 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+    Added an 'undef' keyword (#629), which will evaluate to ""
+    within strings but when used as a resource parameter value
+    will cause that parameter to be evaluated as undefined.
+
     Changed the topological sort algorithm (#507) so it will always
     fail on cycles.