diff --git a/diff.js b/diff.js
index 8bb4917..ba27eef 100644
--- a/diff.js
+++ b/diff.js
@@ -770,16 +770,19 @@ module.Types = {
 		}
 
 
-		// same object...
-		// XXX this will essentially do a full diff of sub-objects, not 
-		// 		sure if this is the right way to go here...
-		// 		...this is not that big a dean as we are caching everything
-		// 		but still this is not obvious...
+		// check: if same/matching object...
+		// NOTE: this will essentially do a full diff of the input trees
+		// 		skipping only the top level, the actual A and B...
+		// NOTE: since actual A and B are not diffed here (as we start with
+		// 		bcmp(..) and not cmp(..), see above note), it makes no 
+		// 		sense to do a cache check after this as we will exit this
+		// 		check with everything but the root cached/diffed...
+		// 		XXX not sure if this is efficient...
 		if(bcmp(A, B, cmp)){
 			return null
 		}
 
-		// builtin types...
+		// check: builtin types...
 		if(this.DIFF_TYPES.has(A) || this.DIFF_TYPES.has(B)){
 			return this.handle('Basic', {}, diff, A, B, options)
 		}