diff --git a/src/js/service/HistoryService.js b/src/js/service/HistoryService.js
index e0e9e5e9..82070bad 100644
--- a/src/js/service/HistoryService.js
+++ b/src/js/service/HistoryService.js
@@ -28,6 +28,7 @@
 
     this.shortcutService.addShortcut('ctrl+Z', this.undo.bind(this));
     this.shortcutService.addShortcut('ctrl+Y', this.redo.bind(this));
+    this.shortcutService.addShortcut('ctrl+shift+Z', this.redo.bind(this));
 
     this.saveState({
       type : ns.HistoryService.SNAPSHOT
diff --git a/src/js/service/keyboard/ShortcutService.js b/src/js/service/keyboard/ShortcutService.js
index 9ffdfa90..fec8da8a 100644
--- a/src/js/service/keyboard/ShortcutService.js
+++ b/src/js/service/keyboard/ShortcutService.js
@@ -14,9 +14,11 @@
 
   /**
    * Add a keyboard shortcut
-   * @param {String}   rawKey   (case insensitive) key can be a meta (optional) + [a-z0-9] or
-   *                            a special key (check list of supported keys in KeycodeTranslator)
-   *                            eg. 'ctrl+A', 'del'
+   * @param {String}   rawKey   (case insensitive) a key is a combination of modifiers + ([a-z0-9] or
+   *                            a special key) (check list of supported special keys in KeycodeTranslator)
+   *                            eg. 'ctrl+A',
+   *                                'del'
+   *                                'ctrl+shift+S'
    * @param {Function} callback should return true to let the original event perform its default action
    */
   ns.ShortcutService.prototype.addShortcut = function (rawKey, callback) {