diff --git a/lib/x11/eventmask.js b/lib/x11/eventmask.js
new file mode 100644
index 0000000..a7ce23d
--- /dev/null
+++ b/lib/x11/eventmask.js
@@ -0,0 +1,28 @@
+module.exports.eventMask {
+    KeyPress: 0x00000001,
+    KeyRelease: 0x00000002,
+    ButtonPress: 0x00000004,
+    ButtonRelease: 0x00000008,
+    EnterWindow: 0x00000010,
+    LeaveWindow: 0x00000020,
+    PointerMotion: 0x00000040,
+    PointerMotionHint: 0x00000080,
+    Button1Motion: 0x00000100,
+    Button2Motion: 0x00000200,
+    Button3Motion: 0x00000400,
+    Button4Motion: 0x00000800,
+    Button5Motion: 0x00001000,
+    ButtonMotion: 0x00002000,
+    KeymapState: 0x00004000,
+    Exposure: 0x00008000,
+    VisibilityChange: 0x00010000,
+    StructureNotify: 0x00020000,
+    ResizeRedirect: 0x00040000,
+    SubstructureNotify: 0x00080000,
+    SubstructureRedirect: 0x00100000,
+    FocusChange: 0x00200000,
+    PropertyChange: 0x00400000,
+    ColormapChange: 0x00800000,
+    OwnerGrabButton: 0x01000000
+    // add more names for common masks combinations
+}
diff --git a/lib/x11/xproto2js.pl b/lib/x11/xproto2js.pl
new file mode 100644
index 0000000..ad13962
--- /dev/null
+++ b/lib/x11/xproto2js.pl
@@ -0,0 +1,12 @@
+# convert X protocol docline
+#     #x00000020     name
+# to JS line 
+#     name: x00000020
+while(<>) {
+    my($line) = $_;
+    chomp($line);
+    if ($line =~ /(x[0-9]+)[ \t]+([^ ]+)/)
+    {
+       print "$2: 0$1,\n"; 
+    }
+}
\ No newline at end of file