diff --git a/demo/kitchen-sink/demo.js b/demo/kitchen-sink/demo.js
index 4495b62d..9e4fa985 100644
--- a/demo/kitchen-sink/demo.js
+++ b/demo/kitchen-sink/demo.js
@@ -177,6 +177,26 @@ env.editor.commands.addCommands([{
             editor.showKeyboardShortcuts()
         })
     }
+}, {
+    name: "increaseFontSize",
+    bindKey: "Ctrl-+",
+    exec: function(editor) {
+        var size = parseInt(editor.getFontSize(), 10) || 12;
+        editor.setFontSize(size + 1);
+    }
+}, {
+    name: "decreaseFontSize",
+    bindKey: "Ctrl+-",
+    exec: function(editor) {
+        var size = parseInt(editor.getFontSize(), 10) || 12;
+        editor.setFontSize(Math.max(size - 1 || 1));
+    }
+}, {
+    name: "resetFontSize",
+    bindKey: "Ctrl+0",
+    exec: function(editor) {
+        editor.setFontSize(12);
+    }
 }]);