V4L/DVB (10487): doc: update hm12 documentation.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/video4linux/cx2341x/README.hm12 b/Documentation/video4linux/cx2341x/README.hm12
index 0e213ed095e6..b36148ea0750 100644
--- a/Documentation/video4linux/cx2341x/README.hm12
+++ b/Documentation/video4linux/cx2341x/README.hm12
@@ -32,6 +32,10 @@ Y, U and V planes. This code assumes frames of 720x576 (PAL) pixels.
 The width of a frame is always 720 pixels, regardless of the actual specified
 width.
 
+If the height is not a multiple of 32 lines, then the captured video is
+missing macroblocks at the end and is unusable. So the height must be a
+multiple of 32.
+
 --------------------------------------------------------------------------
 
 #include <stdio.h>