diff --git a/Documentation/media/uapi/dvb/ca-reset.rst b/Documentation/media/uapi/dvb/ca-reset.rst
index 477313121a6508966f41600cd369c3a0d5ba0f3c..a5dd2797a92f01397b076a5aa2c5754f51a6fc20 100644
--- a/Documentation/media/uapi/dvb/ca-reset.rst
+++ b/Documentation/media/uapi/dvb/ca-reset.rst
@@ -28,7 +28,8 @@ Arguments
 Description
 -----------
 
-.. note:: This ioctl is undocumented. Documentation is welcome.
+Puts the Conditional Access hardware on its initial state. It should
+be called before start using the CA hardware.
 
 
 Return Value