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-rw-r--r--include/media/bt819.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/media/bt819.h b/include/media/bt819.h
index 38f666bde77a..8025f4bc2bb6 100644
--- a/include/media/bt819.h
+++ b/include/media/bt819.h
@@ -26,7 +26,10 @@
/* v4l2_device notifications. */
/* Needed to reset the FIFO buffer when changing the input
- or the video standard. */
+ or the video standard.
+
+ Note: these ioctls that internal to the kernel and are never called
+ from userspace. */
#define BT819_FIFO_RESET_LOW _IO('b', 0)
#define BT819_FIFO_RESET_HIGH _IO('b', 1)

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