documenting udp option

README

@@ -86,7 +86,11 @@ Recording a multicast address to a file:
 
 multicat @239.255.0.1:5004 /tmp/myfile.ts
 
-This will also create file /tmp/myfile.aux. Playing back the file:
+Recording a udp multicast address to a file:
+
+multicat -u @239.255.0.1:5004 /tmp/myfile.ts
+
+These recordings will also create a file /tmp/myfile.aux. Playing back the file:
 
 multicat -p 68 /tmp/myfile.ts 239.255.0.2:5004
 

multicat.1

@@ -61,7 +61,7 @@ Overwrite or create RTP SSRC
 TTL of the packets send by multicat
 .TP
 .B \-u
-Source has no RTP header
+Source has no RTP header, possibly a udp source
 .TP
 .B \-U
 Destination has no RTP header