diff --git a/src/client.ts b/src/client.ts
index 5bc958375..514be982b 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -8992,7 +8992,7 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
      * @param identityAccessToken - The `access_token` field of the Identity
      * Server `/account/register` response (see {@link registerWithIdentityServer}).
      *
-     * @returns Promise which resolves: Object, currently with no parameters.
+     * @returns Promise which resolves: Object, containing success boolean.
      * @returns Rejects: with an error response.
      * @throws Error if No identity server is set
      */
@@ -9001,8 +9001,7 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
         clientSecret: string,
         msisdnToken: string,
         identityAccessToken: string,
-    ): Promise<any> {
-        // TODO: Types
+    ): Promise<{ success: boolean }> {
         const params = {
             sid: sid,
             client_secret: clientSecret,
@@ -9033,7 +9032,7 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
      *                 This must be the same value submitted in the requestToken call.
      * @param msisdnToken - The MSISDN token, as enetered by the user.
      *
-     * @returns Promise which resolves: Object, currently with no parameters.
+     * @returns Promise which resolves: Object, containing success boolean.
      * @returns Rejects: with an error response.
      */
     public submitMsisdnTokenOtherUrl(
@@ -9041,8 +9040,7 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
         sid: string,
         clientSecret: string,
         msisdnToken: string,
-    ): Promise<any> {
-        // TODO: Types
+    ): Promise<{ success: boolean }> {
         const params = {
             sid: sid,
             client_secret: clientSecret,