diff --git a/packages/x-date-pickers/src/models/adapters.ts b/packages/x-date-pickers/src/models/adapters.ts
index 4c182413f444c..f91b44dc2d452 100644
--- a/packages/x-date-pickers/src/models/adapters.ts
+++ b/packages/x-date-pickers/src/models/adapters.ts
@@ -191,9 +191,10 @@ export interface MuiPickersAdapter<TLocale = any> {
     value?: T,
     timezone?: PickersTimezone,
   ): DateBuilderReturnType<T>;
+  // TODO v9: Remove.
   /**
    * Creates an invalid date in the date library format.
-   * @deprecated TODO Add message
+   * @deprecated This method will be removed in the next major release (v9.0.0).
    * @returns {PickerValidDate} The invalid date.
    */
   getInvalidDate(): PickerValidDate;