docs: clarify ASN lookup defaults

diff --git a/man/mtr.8.in b/man/mtr.8.in
index 5101094497b275ad37acf111483359092aea9ee4..778a0b878925ac1538bdf02cd899060ae25e622d 100644 (file)
--- a/man/mtr.8.in
+++ b/man/mtr.8.in
@@ -341,9 +341,12 @@ ll.
 .br
 
 It is possible to cycle between these fields at runtime (using the \fBy\fR key).
+IP information lookup is disabled by default unless this option or
+\fB-z\fR is used.
 .TP
 .B \-z\fR, \fB\-\-aslookup
 Displays the Autonomous System (AS) number alongside each hop.  Equivalent to \fB\-\-ipinfo 0\fR.
+In curses mode, use the \fBz\fR key to toggle ASN display on or off at runtime.
 .IP
 Example (columns to the right not shown for clarity):
 .nf