Document the -y option in the manpage

diff --git a/mtr.8 b/mtr.8
index e225b3b427b3ac9a949a60ec92d736c946fab510..8617755a8b112fbf176a0ed0809aa95a97158901 100644 (file)
--- a/mtr.8
+++ b/mtr.8
@@ -284,10 +284,22 @@ Example:
 -o "LSD NBAW  X"
 .TP
 .B \-y \fIn\fR, \fB\-\-ipinfo \fIn
-MISSING
+Displays information about each IP hop.  Valid values for \fIn\fR are:
+.TS
+tab(%);
+ll.
+0%Display AS number (equivalent to \fB-z\fR)
+1%Display IP prefix
+2%Display country code of the origin AS
+3%Display RIR (ripencc, arin, ...)
+4%Display the allocation date of the IP prefix
+.TE
+.br
+
+It is possible to cycle between these fields at runtime (using the \fBy\fR key).
 .TP
 .B \-z\fR, \fB\-\-aslookup
-Displays the Autonomous System (AS) number alongside each hop.
+Displays the Autonomous System (AS) number alongside each hop.  Equivalent to \fB\-\-ipinfo 0\fR.
 .IP
 Example (columns to the right not shown for clarity):
 .nf