diff --git "a/\342\234\205  Pattern 02: Two Pointers.md" "b/\342\234\205  Pattern 02: Two Pointers.md"
index e77d013..d4dc0f0 100644
--- "a/\342\234\205  Pattern 02: Two Pointers.md"	
+++ "b/\342\234\205  Pattern 02: Two Pointers.md"	
@@ -569,7 +569,7 @@ function searchPairs(arr, targetSum, first, second, quads) {
         //skip the same element to avoid duplicate quadruplets
         start++
       }
-      while(start < end && arr[end] === arr[end -1]){
+      while(start < end && arr[end] === arr[end +1]){
         //skip the same element to avoid duplicate quadruplets
         end--
       }