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diff --git a/date-fns/src/addHours/index.ts b/date-fns/src/addHours/index.ts
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+import toInteger from '../_lib/toInteger/index'
+import addMilliseconds from '../addMilliseconds/index'
+import requiredArgs from '../_lib/requiredArgs/index'
+
+const MILLISECONDS_IN_HOUR = 3600000
+
+/**
+ * @name addHours
+ * @category Hour Helpers
+ * @summary Add the specified number of hours to the given date.
+ *
+ * @description
+ * Add the specified number of hours to the given date.
+ *
+ * ### v2.0.0 breaking changes:
+ *
+ * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of hours to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the hours added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 2 hours to 10 July 2014 23:00:00:
+ * const result = addHours(new Date(2014, 6, 10, 23, 0), 2)
+ * //=> Fri Jul 11 2014 01:00:00
+ */
+export default function addHours(
+  dirtyDate: Date | number,
+  dirtyAmount: number
+): Date {
+  requiredArgs(2, arguments)
+
+  const amount = toInteger(dirtyAmount)
+  return addMilliseconds(dirtyDate, amount * MILLISECONDS_IN_HOUR)
+}