diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index f60cf9cf3b9cff9381bef6e125a3989e33b906f4..73073f6ee48cf8b4b25bda5d0fa0439a3cef35a7 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -30,6 +30,7 @@
  * @VFL_TYPE_SUBDEV:	for V4L2 subdevices
  * @VFL_TYPE_SDR:	for Software Defined Radio tuners
  * @VFL_TYPE_TOUCH:	for touch sensors
+ * @VFL_TYPE_MAX:	number of VFL types, must always be last in the enum
  */
 enum vfl_devnode_type {
 	VFL_TYPE_GRABBER	= 0,