diff --git a/npm/ng-packs/packages/theme-shared/src/lib/services/modal.service.ts b/npm/ng-packs/packages/theme-shared/src/lib/services/modal.service.ts
index de63164810..a75cfe5089 100644
--- a/npm/ng-packs/packages/theme-shared/src/lib/services/modal.service.ts
+++ b/npm/ng-packs/packages/theme-shared/src/lib/services/modal.service.ts
@@ -2,6 +2,9 @@ import { ContentProjectionService, PROJECTION_STRATEGY } from '@abp/ng.core';
 import { ComponentRef, Injectable, TemplateRef, ViewContainerRef, OnDestroy } from '@angular/core';
 import { ModalContainerComponent } from '../components/modal/modal-container.component';
 
+/**
+ * @deprecated Use ng-bootstrap modal. To be deleted in v5.0.
+ */
 @Injectable({
   providedIn: 'root',
 })