diff --git a/index.d.ts b/index.d.ts
index 3ccc4472..d770931a 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -10,7 +10,7 @@ export interface KeyHandler {
   (keyboardEvent: KeyboardEvent, hotkeysEvent: HotkeysEvent): void | boolean
 }
 
-type Options = {
+export type Options = {
   scope?: string,
   element?: HTMLElement | null,
   keyup?: boolean | null
@@ -47,6 +47,8 @@ interface Hotkeys {
   getPressedKeyCodes(): number[]
 
   filter(event: KeyboardEvent): boolean
+
+  addCustomKeyMap(customKeyMap: Record<string, number>): void
 }
 // https://github.com/eiriklv/react-masonry-component/issues/57
 declare var hotkeys: Hotkeys
diff --git a/src/main.js b/src/main.js
index c65ffcf1..006e586d 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,13 +1,14 @@
-import { addEvent, getMods, getKeys, compareArray } from './utils';
+import { addEvent, getMods, getKeys, compareArray, isInteger } from './utils';
 import { _keyMap, _modifier, modifierMap, _mods, _handlers } from './var';
 
 let _downKeys = []; // 记录摁下的绑定键
+const _customKeyMap = {};
 
 let _scope = 'all'; // 默认热键范围
 const elementHasBindEvent = []; // 已绑定事件的节点记录
 
 // 返回键码
-const code = (x) => _keyMap[x.toLowerCase()]
+const code = (x) => _customKeyMap[x] || _keyMap[x.toLowerCase()]
   || _modifier[x.toLowerCase()]
   || x.toUpperCase().charCodeAt(0);
 
@@ -24,6 +25,28 @@ function getPressedKeyCodes() {
   return _downKeys.slice(0);
 }
 
+function addCustomKeyMap(keyMapPatch) {
+  if (typeof _keyMapPatch !== 'object') {
+    return;
+  }
+
+  const _keyMapPatch = {};
+
+  // check that all values for each key is integer
+  Object.keys(_keyMapPatch).forEach((key) => {
+    const keyCode = keyMapPatch[key];
+
+    if (isInteger(keyCode)) {
+      _keyMapPatch[key] = keyCode;
+    } else if (module.hot) {
+      window.console.warning(`[hotkeys-js] (addCustomKeyMap) key "${key}" has wrong value type, ignored`);
+    }
+  });
+
+  // merge only valid keyCodes
+  Object.assign(_customKeyMap, _keyMapPatch);
+}
+
 // 表单控件控件判断 返回 Boolean
 // hotkey is effective only when filter return true
 function filter(event) {
@@ -390,6 +413,7 @@ const _api = {
   isPressed,
   filter,
   unbind,
+  addCustomKeyMap,
 };
 for (const a in _api) {
   if (Object.prototype.hasOwnProperty.call(_api, a)) {
diff --git a/src/utils.js b/src/utils.js
index fd8d8c9f..fbfeb9a5 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -45,10 +45,15 @@ function compareArray(a1, a2) {
   return isIndex;
 }
 
+function isInteger(value) {
+  return typeof value === 'number' && Number.isFinite(value) && Math.floor(value) === value;
+}
+
 export {
   isff,
   getMods,
   getKeys,
   addEvent,
   compareArray,
+  isInteger,
 };