diff --git a/browser/main/Detail/FullscreenButton.js b/browser/main/Detail/FullscreenButton.js
index 3d29c264..ee212603 100644
--- a/browser/main/Detail/FullscreenButton.js
+++ b/browser/main/Detail/FullscreenButton.js
@@ -4,12 +4,14 @@ import CSSModules from 'browser/lib/CSSModules'
 import styles from './FullscreenButton.styl'
 import i18n from 'browser/lib/i18n'
 
+const OSX = global.process.platform === 'darwin'
+const hotkey = (OSX ? i18n.__('Command(⌘)') : i18n.__('Ctrl(^)')) + '+B'
 const FullscreenButton = ({
  onClick
 }) => (
   <button styleName='control-fullScreenButton' title={i18n.__('Fullscreen')} onMouseDown={(e) => onClick(e)}>
     <img styleName='iconInfo' src='../resources/icon/icon-full.svg' />
-    <span styleName='tooltip'>{i18n.__('Fullscreen')}</span>
+    <span styleName='tooltip'>{i18n.__('Fullscreen')}({hotkey})</span>
   </button>
 )