diff --git a/lib/x11/keysyms.js b/lib/x11/keysyms.js
index 688c982..5d6ba72 100644
--- a/lib/x11/keysyms.js
+++ b/lib/x11/keysyms.js
@@ -1,3 +1,4 @@
+// TODO: add more XF86XK_* codes from http://codesearch.google.com/#FIqYkqGz-i8/classlib/modules/awt/src/main/java/unix/org/apache/harmony/awt/nativebridge/linux/X11Defs.java
 module.exports = {
     XK_VoidSymbol: 0xFFFFFF,
     XK_BackSpace: 0xFF08,