diff --git a/doc/TODO b/doc/TODO
index 9528b04d4a1..be08262dc3b 100644
--- a/doc/TODO
+++ b/doc/TODO
@@ -133,6 +133,7 @@ TYPES
 * Make Absolutetime/Relativetime int4 because time_t can be int8 on some ports
 * Functions returning sets don't really work right[function]
 * Make type equivalency apply to aggregates
+* allow aggregates on oid
 
 VIEWS