diff --git a/doc/pattyd.conf.5 b/doc/pattyd.conf.5
index 1215f58..f79e737 100644
--- a/doc/pattyd.conf.5
+++ b/doc/pattyd.conf.5
@@ -42,6 +42,22 @@ as follows:
 .It Li flow Ar crtscts
 .It Li flow Ar xonxoff 
 .El
+.It Li if Ar ifname Li ax25 Ar MYCALL Li aprs-is Ar args ...
+Raise an interface named
+.Ar ifname ,
+with the callsign
+.Ar MYCALL
+attached to an APRS-IS client.  The following
+.Ar args ...
+must be provided:
+.Bl -tag
+.It Li 
+.It Li host Ar host.aprs.is
+.It Li port Ar 14580
+.It Li user Ar MYCALL
+.It Li pass Ar 12345
+.It Li filter Ar spec
+.El
 .It Li route station Ar CALLSGN Li if Ar ifname Li path Ar HOP1 Op ...
 Add a static route to reach
 .Ar CALLSGN