diff --git a/src/Target.re b/src/Target.re
index bc5f637..e467b71 100644
--- a/src/Target.re
+++ b/src/Target.re
@@ -22,8 +22,15 @@ let pageTypeFromJs = targetTypeFromJs;
 
 [@bs.send] external browser : t => Types.browser = "";
 
+/* TODO: browserContext() */
+
 [@bs.send] external createCDPSession : t => Js.Promise.t(CDPSession.t) = "";
 
+/** Target that opened this target. Top-level targets don't have an opener. */
+[@bs.send]
+[@bs.return nullable]
+external opener : t => option(t) = "";
+
 [@bs.send] external page : t => Js.Promise.t(Js.Nullable.t(Page.t)) = "";
 
 [@bs.send] external typeString : t => string = "type";