diff --git a/types/camelcase-keys/index.d.ts b/types/camelcase-keys/index.d.ts
index f6be6b7f03..e29a576e6b 100644
--- a/types/camelcase-keys/index.d.ts
+++ b/types/camelcase-keys/index.d.ts
@@ -1,7 +1,15 @@
-// Type definitions for camelcase-keys 4.0
+// Type definitions for camelcase-keys 4.1
 // Project: https://github.com/sindresorhus/camelcase-keys#readme
 // Definitions by: Mohamed Hegazy <https://github.com/mhegazy>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
 
 export = camelcaseKeys;
 declare function camelcaseKeys(input: any, options?: { exclude?: string[] | RegExp[], deep?: boolean }): any;
+
+declare namespace camelcaseKeys {
+    interface Options {
+        deep?: boolean;
+        exclude?: Array<string | RegExp>;
+    }
+}