[media] DVB: Docbook update for DTV_ENUM_DELSYS

Signed-off-by: Manu Abraham <abraham.manu@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/DocBook/media/dvb/dvbproperty.xml

@@ -649,6 +649,18 @@ typedef enum fe_hierarchy {
 			many data types via a single multiplex. The API will soon support this
 			at which point this section will be expanded.</para>
 	</section>
+	<section id="DTV_ENUM_DELSYS">
+		<title><constant>DTV_ENUM_DELSYS</constant></title>
+		<para>A Multi standard frontend needs to advertise the delivery systems provided.
+			Applications need to enumerate the provided delivery systems, before using
+			any other operation with the frontend. Prior to it's introduction,
+			FE_GET_INFO was used to determine a frontend type. A frontend which
+			provides more than a single delivery system, FE_GET_INFO doesn't help much.
+			Applications which intends to use a multistandard frontend must enumerate
+			the delivery systems associated with it, rather than trying to use
+			FE_GET_INFO. In the case of a legacy frontend, the result is just the same
+			as with FE_GET_INFO, but in a more structured format </para>
+	</section>
 </section>
 	<section id="frontend-property-terrestrial-systems">
 	<title>Properties used on terrestrial delivery systems</title>