diff --git a/libnm-glib/nm-device-adsl.c b/libnm-glib/nm-device-adsl.c
index 67aad9e80..bef3ceae4 100644
--- a/libnm-glib/nm-device-adsl.c
+++ b/libnm-glib/nm-device-adsl.c
@@ -72,7 +72,7 @@ nm_device_adsl_error_quark (void)
  *
  * Creates a new #NMDeviceAdsl.
  *
- * Returns: a new device
+ * Returns: (transfer full): a new device
  **/
 GObject *
 nm_device_adsl_new (DBusGConnection *connection, const char *path)