diff --git a/TODO b/TODO
index 46939830..c9219709 100644
--- a/TODO
+++ b/TODO
@@ -30,6 +30,7 @@
    - [ ] don't make test mail files executable
    - [X] add summary unit test(s)
    - [ ] add attachment unit test(s)
+   - [ ] fix e-mail address searches (issue #21)