diff --git a/gio/gdbusconnection.h b/gio/gdbusconnection.h
index c37363c0d..f7f08a3cc 100644
--- a/gio/gdbusconnection.h
+++ b/gio/gdbusconnection.h
@@ -489,7 +489,7 @@ typedef GDBusInterfaceInfo ** (*GDBusSubtreeIntrospectFunc) (GDBusConnection
  * @object_path: The object path that was registered with g_dbus_connection_register_subtree().
  * @interface_name: The D-Bus interface name that the method call or property access is for.
  * @node: A node that is a child of @object_path (relative to @object_path) or %NULL for the root of the subtree.
- * @out_user_data: (nullable) (not optional): Return location for user data to pass to functions in the returned #GDBusInterfaceVTable (never %NULL).
+ * @out_user_data: (nullable) (not optional): Return location for user data to pass to functions in the returned #GDBusInterfaceVTable.
  * @user_data: The @user_data #gpointer passed to g_dbus_connection_register_subtree().
  *
  * The type of the @dispatch function in #GDBusSubtreeVTable.