diff --git a/notes.org b/notes.org
index 72a0aaa..48d053d 100644
--- a/notes.org
+++ b/notes.org
@@ -67,7 +67,28 @@ global.display.connect(
             display, action, deviceId, timestamp)
     })
 #+END_SRC
+** Lookup an keybinding action by a accelerator string
+~global.display.get_keybinding_action(keycode, mask)~ is simple to use in clutter event handlers since the keycode and mask is readily available. Outside of clutter is harder:
 
+#+BEGIN_SRC javascript
+function devirtualizeMask(gdkVirtualMask) {
+    const keymap = Gdk.Keymap.get_default();
+    let [success, rawMask] = keymap.map_virtual_modifiers(gdkVirtualMask);
+    if (!success)
+        throw new Error("Couldn't devirtualize mask " + gdkVirtualMask);
+    return rawMask;
+}
+
+function getBoundActionId(keystr) {
+    let [dontcare, keycodes, mask] =
+        Gtk.accelerator_parse_with_keycode(keystr);
+    if(keycodes.length > 1) {
+        throw new Error("Multiple keycodes " + keycodes + " " + keystr);
+    }
+    const rawMask = devirtualizeMask(mask);
+    return global.display.get_keybinding_action(keycodes[0], rawMask);
+}
+#+END_SRC
 * GJS
 ** import system / module system
 `imports.NAME` reflects the directories and javascript files present in `imports.searchPath`.