diff --git a/chapter01/1.1 - Is Unique/isUnique.js b/chapter01/1.1 - Is Unique/isUnique.js
index 136496c..967cf6b 100644
--- a/chapter01/1.1 - Is Unique/isUnique.js	
+++ b/chapter01/1.1 - Is Unique/isUnique.js	
@@ -1,4 +1,5 @@
 var allUniqueChars = function(string) {
+  if (string.length > 128) returne false;
   
   // O(n^2) approach, no additional data structures used
   // for each character, check remaining characters for duplicates
@@ -13,4 +14,4 @@ var allUniqueChars = function(string) {
 };
 
 /* TESTS */
-// log some tests here
\ No newline at end of file
+// log some tests here