diff --git a/todo.md b/todo.md
index fc88d1d..37f9803 100644
--- a/todo.md
+++ b/todo.md
@@ -3,4 +3,5 @@
 - change filter types
   - regex -> regex replace
   - regex extract (with groups?)
-  - substring ":4" "28:" "-100:"
\ No newline at end of file
+  - substring ":4" "28:" "-100:"
+- add error reporting to filters
\ No newline at end of file