Print which option was in error along with usage message

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/dsimple.c b/dsimple.c
index 2ec899c..67e59c0 100644
--- a/dsimple.c
+++ b/dsimple.c
@@ -75,7 +75,7 @@ Get_Display_Name(int *pargc/* MODIFIED */, char **argv/* MODIFIED */)
 	char *arg = argv[i];
 
 	if (!strcmp (arg, "-display") || !strcmp (arg, "-d")) {
-	    if (++i >= argc) usage ();
+	    if (++i >= argc) usage ("-display requires an argument");
 
 	    displayname = argv[i];
 	    *pargc -= 2;