diff --git a/Viewer/features/core.js b/Viewer/features/core.js
index cb6bc5ef..cc8bed17 100755
--- a/Viewer/features/core.js
+++ b/Viewer/features/core.js
@@ -1027,7 +1027,6 @@ module.Serialization = ImageGridFeatures.Feature({
 //---------------------------------------------------------------------
 // Cache...
 	
-// XXX should this be in actions.js???
 // XXX revise: cache group naming...
 // 		currently the used groups are:
 // 			Session groups -- cleared on .clear() ('cache')
@@ -1106,7 +1105,19 @@ var CacheActions = actions.Actions({
 			.cache(group, title, handler)
 				-> value
 		
+
+		Currently the used groups are:
+			Session groups -- cleared on .clear() (feature: 'cache')
+				session-*
+				view-*
+			View groups -- cleared by crop/collection (feature: 'crop', 'collections')
+				view-*
+			Changes groups -- cleared when specific changes are made (feature: 'changes')
+				*-data
+				*-images
+				...
 		
+
 		Example use:
 			someAction: [
 				function(){
diff --git a/Viewer/features/sharp.js b/Viewer/features/sharp.js
index 83d2a827..45e5eda4 100755
--- a/Viewer/features/sharp.js
+++ b/Viewer/features/sharp.js
@@ -927,5 +927,6 @@ module.Sharp = core.ImageGridFeatures.Feature({
 
 
 
+
 /**********************************************************************
 * vim:set ts=4 sw=4 :                               */ return module })