diff --git a/ng2-components/ng2-alfresco-viewer/README.md b/ng2-components/ng2-alfresco-viewer/README.md
index d699cc78ab..41b12c4610 100644
--- a/ng2-components/ng2-alfresco-viewer/README.md
+++ b/ng2-components/ng2-alfresco-viewer/README.md
@@ -104,11 +104,10 @@ bootstrap(MyDemoApp, [
 
 #### Options
 
-Attribute     | Options     | Default      | Description
+Attribute     | Options     | Default      | Description | Mandatory
 ---           | ---         | ---          | ---
-`urlFile`         | *string*    |        | Url where load the file
----           | ---         | ---          | ---
-`overlayMode`         | *boolean*    | `false`        | if true Show the Viewer full page over the present content 
+`urlFile`         | *string*    |        |  Url where to load the file | mandatory
+`overlayMode`         | *boolean*    | `false`        | if true Show the Viewer full page over the present content |
 
 
 ## Build from sources
diff --git a/ng2-components/ng2-alfresco-viewer/src/viewer.component.spec.ts b/ng2-components/ng2-alfresco-viewer/src/viewer.component.spec.ts
index 6509675107..8a3e4ffdc3 100644
--- a/ng2-components/ng2-alfresco-viewer/src/viewer.component.spec.ts
+++ b/ng2-components/ng2-alfresco-viewer/src/viewer.component.spec.ts
@@ -36,13 +36,13 @@ describe('Ng2-alfresco-viewer', () => {
                 });
         }));
 
-        it('shadow overlay shoudl be present if overlay is true', injectAsync([TestComponentBuilder], (tcb: TestComponentBuilder) => {
+        it('shadow overlay should be present if overlay is true', injectAsync([TestComponentBuilder], (tcb: TestComponentBuilder) => {
             return tcb
                 .createAsync(ViewerComponent)
                 .then((fixture) => {
                     let element = fixture.nativeElement;
                     let component = fixture.componentInstance;
-
+                    component.urlFile = 'fake-url-file';
                     component.overlayMode = true;
 
                     fixture.detectChanges();
@@ -90,7 +90,7 @@ describe('Ng2-alfresco-viewer', () => {
                 });
         }));
 
-        it('Name File should be showed', injectAsync([TestComponentBuilder], (tcb: TestComponentBuilder) => {
+        it('Name File should be present', injectAsync([TestComponentBuilder], (tcb: TestComponentBuilder) => {
             return tcb
                 .createAsync(ViewerComponent)
                 .then((fixture) => {
@@ -108,4 +108,18 @@ describe('Ng2-alfresco-viewer', () => {
                 });
         }));
     });
+
+    describe('Attribute', () => {
+        it('Url File should be mandatory', injectAsync([TestComponentBuilder], (tcb: TestComponentBuilder) => {
+            return tcb
+                .createAsync(ViewerComponent)
+                .then((fixture) => {
+                    let component = fixture.componentInstance;
+
+                    expect(() => {
+                        component.urlFile = 'fake-url-file';
+                    }).toThrow();
+                });
+        }));
+    });
 });
diff --git a/ng2-components/ng2-alfresco-viewer/src/viewer.component.ts b/ng2-components/ng2-alfresco-viewer/src/viewer.component.ts
index 6aba8d83c6..e5e884b9f3 100644
--- a/ng2-components/ng2-alfresco-viewer/src/viewer.component.ts
+++ b/ng2-components/ng2-alfresco-viewer/src/viewer.component.ts
@@ -40,6 +40,12 @@ export class ViewerComponent {
     displayPage: number;
     totalPages: number;
 
+    ngOnInit() {
+        if (!this.urlFile) {
+            throw new Error('Attribute urlFile is required');
+        }
+    }
+
     ngOnChanges(changes: {[urlFile: string]: SimpleChange}) {
         if (this.urlFile) {
             this.nameFile = this.getPDFJS().getFilenameFromUrl(this.urlFile);
@@ -53,8 +59,6 @@ export class ViewerComponent {
                 this.displayPage = 1;
                 this.loadPage(this.currentPdfDocument);
             });
-        } else {
-            console.log('Url File is a required value');
         }
     }