diff --git a/examples/server/server.c b/examples/server/server.c
index f96b04b7c..9bd5cc4c5 100644
--- a/examples/server/server.c
+++ b/examples/server/server.c
@@ -230,6 +230,9 @@ static void Usage(void)
 #endif
     printf("-i          Loop indefinitely (allow repeated connections)\n");
     printf("-e          Echo data mode (return raw bytes received)\n");
+#ifdef HAVE_NTRU
+    printf("-n          Use NTRU key (needed for NTRU suites)\n");
+#endif
     printf("-B <num>    Benchmark throughput using <num> bytes and print stats\n");
 }