Update readme.md

.readme/readme.md

@@ -8,6 +8,11 @@ EPG (Electronic Program Guide) for thousands of TV channels collected from diffe
 
 To load a program guide, all you need to do is copy the link to one or more of the guides from the list below and paste it into your favorite player.
 
+
+## Which guide to use?
+
+To find out which guide(s) a channel is included in, search on https://iptv-org.github.io/
+
 ## Guides
 
 All guides also have a compressed and JSON version. To load them just change the extension from `.xml` to `.xml.gz` or `.json` respectively.