diff --git a/drivers/media/video/cx23885/cx23885-video.c b/drivers/media/video/cx23885/cx23885-video.c
index eaa1189..c2ed250 100644
--- a/drivers/media/video/cx23885/cx23885-video.c
+++ b/drivers/media/video/cx23885/cx23885-video.c
@@ -244,6 +244,7 @@
 };
 static const int CX23885_CTLS = ARRAY_SIZE(cx23885_ctls);
 
+/* Must be sorted from low to high control ID! */
 static const u32 cx23885_user_ctrls[] = {
 	V4L2_CID_USER_CLASS,
 	V4L2_CID_BRIGHTNESS,