diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 7b03b19..47db4df 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -392,6 +392,7 @@
 		if (sv->drm_di_minor >= 1) {
 			/*
 			 * Version 1.1 includes tying of DRM to specific device
+			 * Version 1.4 has proper PCI domain support
 			 */
 			retcode = drm_set_busid(dev, file_priv);
 			if (retcode)