diff --git a/apps/documenteditor/mobile/locale/en.json b/apps/documenteditor/mobile/locale/en.json
index 256d9cef3..013b6cd6d 100644
--- a/apps/documenteditor/mobile/locale/en.json
+++ b/apps/documenteditor/mobile/locale/en.json
@@ -476,6 +476,8 @@
     "errorUpdateVersion": "The file version has been changed. The page will be reloaded.",
     "leavePageText": "You have unsaved changes. Click 'Stay on this Page' to wait for autosave. Click 'Leave this Page' to discard all the unsaved changes.",
     "notcriticalErrorTitle": "Warning",
+    "textDocumentProtected": "The document is protected. Edit settings are not available",
+    "textOk": "Ok",
     "SDK": {
       " -Section ": " -Section ",
       "above": "above",
diff --git a/apps/documenteditor/mobile/src/controller/Main.jsx b/apps/documenteditor/mobile/src/controller/Main.jsx
index 274bede68..6deb76d39 100644
--- a/apps/documenteditor/mobile/src/controller/Main.jsx
+++ b/apps/documenteditor/mobile/src/controller/Main.jsx
@@ -790,6 +790,7 @@ class MainController extends Component {
     }
 
     onChangeProtectDocument() {
+        const { t } = this.props;
         const storeAppOptions = this.props.storeAppOptions;
         const props = this.getDocProps(true);
         const isProtected = props && (props.isReadOnly || props.isCommentsOnly || props.isFormsOnly || props.isReviewOnly);
@@ -797,6 +798,18 @@ class MainController extends Component {
         storeAppOptions.setProtection(isProtected);
         props && this.applyRestrictions(props.type);
         Common.Notifications.trigger('protect:doclock', props);
+
+        if(isProtected) {
+            f7.dialog.create({
+                title: t('Main.notcriticalErrorTitle'),
+                text: t('Main.textDocumentProtected'),
+                buttons: [
+                    {
+                        text: t('Main.textOk')
+                    }
+                ]
+            }).open();
+        }
     }
 
     applyRestrictions(type) {