diff --git a/TODO b/TODO
index 9c89a9f9..99961119 100644
--- a/TODO
+++ b/TODO
@@ -8,3 +8,4 @@
   default=$foo}, then using $bar in included template, instead of $foo.bar
 * support implementations of prefiltes, mods, and others as class methods.
 * possibly implement default modifiers that apply to variables upon display
+* possibly implement undefined template tags custom handling