diff --git a/types/natural-sort/index.d.ts b/types/natural-sort/index.d.ts
index 4e929d4edc..3a88919a25 100644
--- a/types/natural-sort/index.d.ts
+++ b/types/natural-sort/index.d.ts
@@ -1,9 +1,18 @@
 // Type definitions for NaturalSort
 // Project: https://github.com/studio-b12/natural-sort
 // Definitions by: Antonio Morales <https://github.com/a-morales>
+//                 Brian Crowell <https://github.com/fluggo>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 export as namespace naturalSort;
 
-declare function naturalSort<T>(a: T, b: T): number;
+interface Options {
+    /** Set to true to make the sort case-sensitive. */
+    caseSensitive?: boolean;
+
+    /** Set to 'desc' to sort in reverse. */
+    direction?: 'desc'
+}
+
+declare function naturalSort(options?: Options): (a: string | number, b: string | number) => number;
 export = naturalSort;
diff --git a/types/natural-sort/natural-sort-tests.ts b/types/natural-sort/natural-sort-tests.ts
index b336542520..6218f4e796 100644
--- a/types/natural-sort/natural-sort-tests.ts
+++ b/types/natural-sort/natural-sort-tests.ts
@@ -1,5 +1,8 @@
 
 import naturalSort = require("natural-sort");
 
-[5, 3, 2, 4, 1].sort(naturalSort);
-["a", "c", "b", "z", "w", "l"].sort(naturalSort);
+['10. tenth', 'odd', 1, '', '2. second'].sort(naturalSort());
+[3, 4, 1, 5, 2].sort(naturalSort({direction: 'desc'}));
+
+['a', 'B'].sort(naturalSort());
+['a', 'B'].sort(naturalSort({caseSensitive: true}));