media: docs: v4l2-controls: document file to include

The tutorial in this section is almost complete, add the one missing bit.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/Documentation/media/kapi/v4l2-controls.rst b/Documentation/media/kapi/v4l2-controls.rst
index 45541e0..407617b 100644 (file)
--- a/Documentation/media/kapi/v4l2-controls.rst
+++ b/Documentation/media/kapi/v4l2-controls.rst
@@ -50,6 +50,10 @@ Basic usage for V4L2 and sub-device drivers
 
 1) Prepare the driver:
 
+.. code-block:: c
+
+       #include <media/v4l2-ctrls.h>
+
 1.1) Add the handler to your driver's top-level struct:
 
 For V4L2 drivers: