diff --git a/extensions/b2g/viewer.html b/extensions/b2g/viewer.html
index cb0f3d3da..8e20d4de9 100644
--- a/extensions/b2g/viewer.html
+++ b/extensions/b2g/viewer.html
@@ -89,10 +89,12 @@ limitations under the License.
         <div id="toolbarSidebar">
           <button id="viewThumbnail"></button>
           <button id="viewOutline"></button>
+          <button id="viewAttachments"></button>
         </div>
         <div id="sidebarContent">
           <div id="thumbnailView"></div>
           <div id="outlineView"></div>
+          <div id="attachmentsView"></div>
         </div>
       </div>  <!-- sidebarContainer -->