diff --git a/src/skymap.c b/src/skymap.c
index d0e9be1..c9216c4 100644
--- a/src/skymap.c
+++ b/src/skymap.c
@@ -164,7 +164,7 @@ usage ()
   printf ("-p, --positions-file    File with xyz positions\n");
   printf ("-L, --longitude    manual site longitude (deg)\n");
   printf ("-B, --latitude    manual site latitude (deg)\n");
-  printf ("-H, --elevation    manual site elevation (m)\n");
+  printf ("-H, --site-elevation    manual site elevation (m)\n");
 
   return;
 }
@@ -736,7 +736,7 @@ main (int argc, char *argv[])
 	{"positions-file", required_argument, 0, 'p'},
 	{"longitude", required_argument, 0, 'L'},
 	{"latitude", required_argument, 0, 'B'},
-	{"elevation", required_argument, 0, 'H'},
+	{"site-elevation", required_argument, 0, 'H'},
 	{"iod", required_argument, 0, 'd'},
 	{"size", required_argument, 0, 'z'},
 	{"all-night", no_argument, 0, 'S'},