Index: trunk/Ohana/src/opihi/dvo/avmatch.c
===================================================================
--- trunk/Ohana/src/opihi/dvo/avmatch.c	(revision 38601)
+++ trunk/Ohana/src/opihi/dvo/avmatch.c	(revision 39225)
@@ -328,4 +328,5 @@
   gprint (GP_ERR, "USAGE: avmatch (RA) (DEC) (RADIUS) field[,field,field...]\n");
   gprint (GP_ERR, "   OR: avmatch -coords (filename.fits) (RADIUS) field[,field,field...]\n");
+  gprint (GP_ERR, "   RADIUS is in arcseconds\n");
 
   if ((argc > N + 1) && !strcasecmp (argv[N+1], "fields")) {