diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 9b1698871..7bc8c6568 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -714,6 +714,21 @@ module TestSortedIndex {
     }, sortedIndexDict);
 }
 
+// _.sortedLastIndex
+module TestSortedLastIndex {
+    result = <number>_.sortedLastIndex([20, 30, 50], 40);
+    result = <number>_.sortedLastIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
+    var sortedLastIndexDict: { wordToNumber: { [idx: string]: number } } = {
+        'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 }
+    };
+    result = <number>_.sortedLastIndex(['twenty', 'thirty', 'fifty'], 'fourty', function (word: string) {
+        return sortedLastIndexDict.wordToNumber[word];
+    });
+    result = <number>_.sortedLastIndex(['twenty', 'thirty', 'fifty'], 'fourty', function (word: string) {
+        return this.wordToNumber[word];
+    }, sortedLastIndexDict);
+}
+
 // _.tail
 module TestTail {
     let array: TResult[];
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index d143f4e65..369b9a926 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -1409,6 +1409,76 @@ declare module _ {
             whereValue: W): number;
     }
 
+    //_.sortedLastIndex
+    interface LoDashStatic {
+        /**
+        * Uses a binary search to determine the highest index at which a value should be inserted
+        * into a given sorted array in order to maintain the sort order of the array. If a callback
+        * is provided it will be executed for value and each element of array to compute their sort
+        * ranking. The callback is bound to thisArg and invoked with one argument; (value).
+        *
+        * If a property name is provided for callback the created "_.pluck" style callback will
+        * return the property value of the given element.
+        *
+        * If an object is provided for callback the created "_.where" style callback will return
+        * true for elements that have the properties of the given object, else false.
+        * @param array The sorted list.
+        * @param value The value to determine its index within `list`.
+        * @param callback Iterator to compute the sort ranking of each value, optional.
+        * @return The index at which value should be inserted into array.
+        **/
+        sortedLastIndex<T, TSort>(
+            array: Array<T>,
+            value: T,
+            callback?: (x: T) => TSort,
+            thisArg?: any): number;
+
+        /**
+        * @see _.sortedLastIndex
+        **/
+        sortedLastIndex<T, TSort>(
+            array: List<T>,
+            value: T,
+            callback?: (x: T) => TSort,
+            thisArg?: any): number;
+
+        /**
+        * @see _.sortedLastIndex
+        * @param pluckValue the _.pluck style callback
+        **/
+        sortedLastIndex<T>(
+            array: Array<T>,
+            value: T,
+            pluckValue: string): number;
+
+        /**
+        * @see _.sortedLastIndex
+        * @param pluckValue the _.pluck style callback
+        **/
+        sortedLastIndex<T>(
+            array: List<T>,
+            value: T,
+            pluckValue: string): number;
+
+        /**
+        * @see _.sortedLastIndex
+        * @param pluckValue the _.where style callback
+        **/
+        sortedLastIndex<W, T>(
+            array: Array<T>,
+            value: T,
+            whereValue: W): number;
+
+        /**
+        * @see _.sortedLastIndex
+        * @param pluckValue the _.where style callback
+        **/
+        sortedLastIndex<W, T>(
+            array: List<T>,
+            value: T,
+            whereValue: W): number;
+    }
+
     //_.tail
     interface LoDashStatic {
         /**