diff --git a/api/src/chat/repositories/subscriber.repository.ts b/api/src/chat/repositories/subscriber.repository.ts
index c58fe7e1..fa59ee70 100644
--- a/api/src/chat/repositories/subscriber.repository.ts
+++ b/api/src/chat/repositories/subscriber.repository.ts
@@ -123,7 +123,7 @@ export class SubscriberRepository extends BaseRepository<
    *
    * @param id - The foreign ID of the subscriber.
    *
-   * @returns The found subscriber entity.
+   * @returns The found subscriber entity, or `null` if no subscriber is found.
    */
   async findOneByForeignId(id: string): Promise<Subscriber | null> {
     const query = this.findByForeignIdQuery(id);