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-rw-r--r--Documentation/video4linux/v4l2-controls.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt
index 0f84ce8c9a7b..5517db602f37 100644
--- a/Documentation/video4linux/v4l2-controls.txt
+++ b/Documentation/video4linux/v4l2-controls.txt
@@ -344,7 +344,9 @@ implement g_volatile_ctrl like this:
}
Note that you use the 'new value' union as well in g_volatile_ctrl. In general
-controls that need to implement g_volatile_ctrl are read-only controls.
+controls that need to implement g_volatile_ctrl are read-only controls. If they
+are not, a V4L2_EVENT_CTRL_CH_VALUE will not be generated when the control
+changes.
To mark a control as volatile you have to set V4L2_CTRL_FLAG_VOLATILE: