Index: trunk/Ohana/src/opihi/cmd.astro/coords.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.astro/coords.c	(revision 17419)
+++ trunk/Ohana/src/opihi/cmd.astro/coords.c	(revision 17484)
@@ -104,4 +104,6 @@
   gprint (GP_ERR, "USAGE: coords [buffer] (-c R D) | (-p X Y)\n");
   gprint (GP_ERR, "only one of -p or -c can be used\n");
+  gprint (GP_ERR, " -p : from pixels to ra/dec\n");
+  gprint (GP_ERR, " -c : from ra/dec to pixels\n");
  escape:
   if (MOSAIC != NULL) free (MOSAIC);