diff --git a/snippets/sortedLastIndex.md b/snippets/sortedLastIndex.md
index 43ecefab5..7f1a90bc7 100644
--- a/snippets/sortedLastIndex.md
+++ b/snippets/sortedLastIndex.md
@@ -9,10 +9,10 @@ Use `Array.reverse()` and `Array.findIndex()` to find the appropriate last index
 const sortedLastIndex = (arr, n) => {
   const isDescending = arr[0] > arr[arr.length - 1];
   const index = arr.reverse().findIndex(el => (isDescending ? n <= el : n >= el));
-  return index === -1 ? 0 : arr.length - index - 1;
+  return index === -1 ? 0 : arr.length - index;
 };
 ```
 
 ```js
-sortedLastIndex([10, 20, 30, 30, 40], 30); // 3
+sortedLastIndex([10, 20, 30, 30, 40], 30); // 4
 ```
diff --git a/test/sortedLastIndex/sortedLastIndex.js b/test/sortedLastIndex/sortedLastIndex.js
index 1fc2a6416..b883fee5f 100644
--- a/test/sortedLastIndex/sortedLastIndex.js
+++ b/test/sortedLastIndex/sortedLastIndex.js
@@ -1,6 +1,6 @@
 const sortedLastIndex = (arr, n) => {
 const isDescending = arr[0] > arr[arr.length - 1];
 const index = arr.reverse().findIndex(el => (isDescending ? n <= el : n >= el));
-return index === -1 ? 0 : arr.length - index - 1;
+return index === -1 ? 0 : arr.length - index;
 };
 module.exports = sortedLastIndex;
\ No newline at end of file
diff --git a/test/sortedLastIndex/sortedLastIndex.test.js b/test/sortedLastIndex/sortedLastIndex.test.js
index cdb77d095..a80ef11dc 100644
--- a/test/sortedLastIndex/sortedLastIndex.test.js
+++ b/test/sortedLastIndex/sortedLastIndex.test.js
@@ -5,7 +5,7 @@ test('Testing sortedLastIndex', (t) => {
   //For more information on all the methods supported by tape
   //Please go to https://github.com/substack/tape
   t.true(typeof sortedLastIndex === 'function', 'sortedLastIndex is a Function');
-  t.equal(sortedLastIndex([10, 20, 30, 30, 40], 30), 3, 'Returns the highest index to insert the element without messing up the list order');
+  t.equal(sortedLastIndex([10, 20, 30, 30, 40], 30), 4, 'Returns the highest index to insert the element without messing up the list order');
   //t.deepEqual(sortedLastIndex(args..), 'Expected');
   //t.equal(sortedLastIndex(args..), 'Expected');
   //t.false(sortedLastIndex(args..), 'Expected');