diff --git a/TODO.org b/TODO.org
index d8ca6c01..1fc05579 100644
--- a/TODO.org
+++ b/TODO.org
@@ -20,6 +20,11 @@ Dyn text stays immutable, with chars and text converting to and from a dyn
 vector of characters; length and indexing count characters on dyn text and bytes on
 str. Waits on the dyn-unless-annotated design.
 
+** NEXT type-of
+Decided 2026-09-25: (type-of x) answers a keyword — :nil :bool :int :float :text :vec
+:map :keyword, :char once dyn has one, and a class instance's class name as class-of
+does; a class named like a built-in kind is refused.
+
 ** NEXT Any typed container crosses into dyn as a view
 Decided 2026-09-25: every element type (all numbers, chars, structs, nested arrays)
 and any storage; a dev build checks a view against its frame or allocation and traps