diff --git a/serialize.js b/serialize.js
index 549e153..c7ee84d 100644
--- a/serialize.js
+++ b/serialize.js
@@ -169,7 +169,6 @@ function(obj, path=[], seen=new Map(), indent, depth=0, options={}){
 
 	// long strings...
 	// NOTE: this saves on output size...
-	// XXX is this relevant when we can "zip" the results...
 	if(typeof(obj) == 'string' 
 			&& obj.length > string_length_ref){
 		seen.set(obj, path) }