diff --git a/c/todo.txt b/c/todo.txt
index d68ebdfb5..70d9eb72a 100644
--- a/c/todo.txt
+++ b/c/todo.txt
@@ -232,6 +232,8 @@ UT FOR 5.0.0:
 * all assert_X() cases
 * all type-decl cases: local/forbind/argpass; initial assign & reuse thereafter.
 
+* unset of localvars, both non-indexed and indexed
+
 * mlr --from s put '$y=strlen($*)'
 * mlr --from s put '$y=strlen({})'