diff --git a/TODO b/TODO
index 2f04df16..df052b41 100644
--- a/TODO
+++ b/TODO
@@ -34,6 +34,8 @@ testsuite
  - newgrp
    - test with unknown user's GID
  - groupmems
+ - useradd, usermod, groupadd, groupmod, newusers
+   - test with UID / GID set to -1
 
 newusers
  - add logging to SYSLOG & AUDIT