diff --git a/apps/spreadsheeteditor/main/app/controller/DataTab.js b/apps/spreadsheeteditor/main/app/controller/DataTab.js
index 070045995..bb318ecca 100644
--- a/apps/spreadsheeteditor/main/app/controller/DataTab.js
+++ b/apps/spreadsheeteditor/main/app/controller/DataTab.js
@@ -115,10 +115,11 @@ define([
             Common.NotificationCenter.on('data:remduplicates', _.bind(this.onRemoveDuplicates, this));
             Common.NotificationCenter.on('data:sortcustom', _.bind(this.onCustomSort, this));
             if (this.toolbar.mode.canRequestReferenceData && this.api) {
-                // this.api.asc_registerCallback('asc_onNeedUpdateExternalReferenceOnOpen', _.bind(this.onNeedUpdateExternalReferenceOnOpen, this));
+                this.api.asc_registerCallback('asc_onNeedUpdateExternalReferenceOnOpen', _.bind(this.onNeedUpdateExternalReferenceOnOpen, this));
                 this.api.asc_registerCallback('asc_onStartUpdateExternalReference', _.bind(this.onStartUpdateExternalReference, this));
                 this.api.asc_registerCallback('asc_onUpdateExternalReference', _.bind(this.onUpdateExternalReference, this));
                 this.api.asc_registerCallback('asc_onErrorUpdateExternalReference', _.bind(this.onErrorUpdateExternalReference, this));
+                this.api.asc_registerCallback('asc_onAddExternalReference', _.bind(this.onAddExternalReference, this));
                 Common.Gateway.on('setreferencedata', _.bind(this.setReferenceData, this));
             }
         },
@@ -559,8 +560,17 @@ define([
         },
 
         onNeedUpdateExternalReferenceOnOpen: function() {
-            var links = this.api.asc_getExternalReferences();
-            links && (links.length>0) && this.api.asc_updateExternalReferences(links);
+            Common.UI.warning({
+                msg: this.warnUpdateExternalData,
+                buttons: [{value: 'ok', caption: this.textUpdate, primary: true}, {value: 'cancel', caption: this.textDontUpdate}],
+                maxwidth: 600,
+                callback: _.bind(function(btn) {
+                    if (btn==='ok') {
+                        var links = this.api.asc_getExternalReferences();
+                        links && (links.length>0) && this.api.asc_updateExternalReferences(links);
+                    }
+                }, this)
+            });
         },
 
         onErrorUpdateExternalReference: function(id) {
@@ -569,6 +579,12 @@ define([
             }
         },
 
+        onAddExternalReference: function() {
+            var val = Common.localStorage.getBool("sse-hide-add-external-warn");
+            !val && Common.NotificationCenter.trigger('showmessage', {msg: this.textAddExternalData});
+            Common.localStorage.setBool("sse-hide-add-external-warn", true);
+        },
+
         onWorksheetLocked: function(index,locked) {
             if (index == this.api.asc_getActiveWorksheetIndex()) {
                 Common.Utils.lockControls(Common.enumLock.sheetLock, locked, {array: this.view.btnsSortDown.concat(this.view.btnsSortUp, this.view.btnCustomSort, this.view.btnGroup, this.view.btnUngroup)});
@@ -612,7 +628,11 @@ define([
         txtImportWizard: 'Text Import Wizard',
         txtUrlTitle: 'Paste a data URL',
         txtErrorExternalLink: 'Error: updating is failed',
-        strSheet: 'Sheet'
+        strSheet: 'Sheet',
+        warnUpdateExternalData: 'This workbook contains links to one or more external sources that could be unsafe.<br>If you trust the links, update them to get the latest data.',
+        textUpdate: 'Update',
+        textDontUpdate: 'Don\'t Update',
+        textAddExternalData: 'Added link to external source. You can update such links in the Data tab.'
 
     }, SSE.Controllers.DataTab || {}));
 });
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