diff --git a/typed-racket-lib/typed-racket/HISTORY.txt b/typed-racket-lib/typed-racket/HISTORY.txt
index ed0edfcc..020f2791 100644
--- a/typed-racket-lib/typed-racket/HISTORY.txt
+++ b/typed-racket-lib/typed-racket/HISTORY.txt
@@ -6,6 +6,7 @@
 - Many types for GUI classes added.
 - Tests on let-bound variables now refine the type of what was bound to them.
 - DrRacket tooltips for types and type errors.
+- Support for prefab structs.
 - Types for a variety of libraries, including `rackunit` and `json`.
 6.1.1
 - Exception handling is now sound. Broke existing programs (e.g. marketplace).