diff --git a/TODO b/TODO
index f4ea1185..9879d278 100644
--- a/TODO
+++ b/TODO
@@ -79,6 +79,7 @@ Future issues:
 * ethercat tool:
     - Add a -n (numeric) switch.
 	- Check for unwanted options.
+    - Fix number of digits in negative integer hex output.
 * Simplify master fsm by introducing a common request state to handle external
   requests (replace write_sii, sdo_request, etc).