diff --git a/ui (gen4)/features/meta.js b/ui (gen4)/features/meta.js
index 70e637a8..568587db 100755
--- a/ui (gen4)/features/meta.js	
+++ b/ui (gen4)/features/meta.js	
@@ -66,8 +66,10 @@ core.ImageGridFeatures.Feature('viewer-testing', [
 	'ui-partial-ribbons-2',
 		'-ui-partial-ribbons',
 	//*/
-	/*/ XXX EXPERIMENTAL: virtual-dom based ribbons...
+	// XXX EXPERIMENTAL: virtual-dom based ribbons...
 	'ui-partial-ribbons-vdom',
+		'-ui-image-marks',
+		'-ui-image-bookmarks',
 		'-ui-partial-ribbons',
 		'-ui-partial-ribbons-2',
 	//*/
diff --git a/ui (gen4)/features/ui-partial-ribbons-vdom.js b/ui (gen4)/features/ui-partial-ribbons-vdom.js
index fc833716..1d157b9e 100755
--- a/ui (gen4)/features/ui-partial-ribbons-vdom.js	
+++ b/ui (gen4)/features/ui-partial-ribbons-vdom.js	
@@ -612,6 +612,12 @@ module.PartialRibbons = core.ImageGridFeatures.Feature({
 					this.updateRibbon(target) 
 				}
 			}],
+
+		// marks...
+		[[
+			'toggleMark',
+			'toggleBookmark',
+		], function(){ this.virtualdom.sync() }],
 	],
 })