diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 4ddfab6e4..99f53330b 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -144,6 +144,7 @@ All definitions files include a header with the author and editors, so at some p
 * [iCheck](http://damirfoy.com/iCheck/) (by [Dániel Tar](https://github.com/qcz))
 * [Impress.js](https://github.com/bartaz/impress.js) (by [Boris Yankov](https://github.com/borisyankov))
 * [Imagemagick](http://github.com/rsms/node-imagemagick) (by [Carlos Ballesteros Velasco](https://github.com/soywiz))
+* [inflection](https://github.com/dreamerslab/node.inflection) (by [Shogo Iwano](https://github.com/shiwano))
 * [insight](https://github.com/yeoman/insight) (by [vvakame](https://github.com/vvakame))
 * [interact.js](http://github.com/taye/interact.js) (by [Douglas Eichelberger](https://github.com/dduugg))
 * [Ion.RangeSlider](https://github.com/IonDen/ion.rangeSlider) (by [Douglas Eichelberger](https://github.com/dduugg))
diff --git a/inflection/inflection-tests.ts b/inflection/inflection-tests.ts
new file mode 100644
index 000000000..b4f758ef3
--- /dev/null
+++ b/inflection/inflection-tests.ts
@@ -0,0 +1,42 @@
+/// <reference path="inflection.d.ts" />
+
+import inflection = require("inflection");
+
+inflection.indexOf(["hi", "there"], "guys");
+
+inflection.pluralize("person");
+inflection.pluralize("person", "guys");
+
+inflection.singularize("Hats");
+inflection.singularize("guys", "person");
+
+inflection.inflect("Hats", 1);
+inflection.inflect("guys", 1, "person");
+
+inflection.camelize("message_properties");
+inflection.camelize("message_properties", true);
+
+inflection.underscore("MP");
+inflection.underscore("MP", true);
+
+inflection.humanize("message_properties");
+inflection.humanize("message_properties", true);
+
+inflection.capitalize("message_properties");
+
+inflection.dasherize("message_properties");
+
+inflection.titleize("message_properties");
+
+inflection.demodulize("Message::Bus::Properties");
+
+inflection.tableize("MessageBusProperty");
+
+inflection.classify("message_bus_properties");
+
+inflection.foreign_key("MessageBusProperty");
+inflection.foreign_key("MessageBusProperty", true);
+
+inflection.ordinalize("the 1 pitch");
+
+inflection.transform("all job", [ "pluralize", "capitalize", "dasherize" ]);
diff --git a/inflection/inflection.d.ts b/inflection/inflection.d.ts
new file mode 100644
index 000000000..528f48f8f
--- /dev/null
+++ b/inflection/inflection.d.ts
@@ -0,0 +1,28 @@
+// Type definitions for inflection 1.5.0
+// Project: https://github.com/dreamerslab/node.inflection
+// Definitions by: Shogo Iwano <https://github.com/shiwano>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+interface Inflection {
+    indexOf<T, T2>(arr: T[], item: T2, from_index?: number, compare_func?: (arr_item: T, item: T2) => boolean): number;
+    pluralize(str: string, plural?: string): string;
+    singularize(str: string, singular?: string): string;
+    inflect(str: string, count: number, singular?: string, plural?: string): string;
+    camelize(str: string, low_first_letter?: boolean): string;
+    underscore(str: string, all_upper_case?: boolean): string;
+    humanize(str: string, low_first_letter?: boolean): string;
+    capitalize(str: string): string;
+    dasherize(str: string): string;
+    titleize(str: string): string;
+    demodulize(str: string): string;
+    tableize(str: string): string;
+    classify(str: string): string;
+    foreign_key(str: string, drop_id_ubar?: boolean): string;
+    ordinalize(str: string): string;
+    transform(str: string, arr: string[]): string;
+}
+
+declare module "inflection" {
+    var inflection: Inflection;
+    export = inflection;
+}