1 files changed, 3 insertions, 1 deletions
diff --git a/tests/nt.c b/tests/nt.c
index 98a4077..876ffb1 100644
--- a/tests/nt.c
+++ b/tests/nt.c
@@ -313,3 +313,5 @@ usage (FILE *fp)
 {
-  fprintf (fp, "usage: nt [-i FILE] [-o FILE] URL\n");
+  fprintf (fp, "usage: nt [-i IFILE] [-o OFILE] URL\n");
+  fprintf (fp, "Reads data from stdin (or IFILE) and sends them to URL.\n");
+  fprintf (fp, "Reads replies from URL and sends them to stdout (or OFILE).\n");
 }