diff --git a/src/content/reference/react/useTransition.md b/src/content/reference/react/useTransition.md
index 6533a201bf3..3a0ec15343e 100644
--- a/src/content/reference/react/useTransition.md
+++ b/src/content/reference/react/useTransition.md
@@ -1684,7 +1684,7 @@ startTransition(() => {
 });
 ```
 
-The function you pass to `startTransition` must be synchronous. You can't mark an update as a Transition like this:
+The function you pass to `startTransition` can be synchronous or asynchronous. However, updates scheduled in a `setTimeout` callback aren't marked as Transitions:
 
 ```js
 startTransition(() => {