diff --git a/TODO b/TODO
index b9c260043130b262e302babf4a1c460126716d7f..7b02c55651d0ab96abb489cd99933d28cdc5d42e 100644
--- a/TODO
+++ b/TODO
@@ -85,6 +85,7 @@ API additions
 hb-view / hb-shape enhancements:
 ===============================
 
+- --output-format should list available formats.
 - Add --width, --height, --auto-size, --align, etc?
 - Add XML and JSON formats to hb-shape
 - --features="init=medi=isol=fina=0"