docs(useMutation): clarify mutationFn option default (#4837)

louis-young · TkDodo · web-flow · commit 61c3d94a94ce · 2023-01-20T13:24:26.000+01:00
* docs(useMutation): clarify `mutationFn` option default

* Make optionality consistent with `useQuery` documentation

Co-authored-by: Dominik Dorfmeister &lt;office@dorfmeister.cc&gt;

Co-authored-by: Dominik Dorfmeister &lt;office@dorfmeister.cc&gt;
diff --git a/docs/react/reference/useMutation.md b/docs/react/reference/useMutation.md
@@ -43,7 +43,7 @@ mutate(variables, {
 **Options**
 
 - `mutationFn: (variables: TVariables) => Promise<TData>`
-  - **Required**
+  - **Required, but only if no default mutation function has been defined**
   - A function that performs an asynchronous task and returns a promise.
   - `variables` is an object that `mutate` will pass to your `mutationFn`
 - `cacheTime: number | Infinity`
