diff --git a/src/meas_lat.c b/src/meas_lat.c
index a97a637..cdc2e5b 100644
--- a/src/meas_lat.c
+++ b/src/meas_lat.c
@@ -395,6 +395,6 @@ int main(int argc, char** argv) {
 
   return 0;
 usage:
-  fprintf(stderr, "Usage: %s -h <host> -p <port> [-l] [-t <udp|tor>] [-c <count>] [-i <ms>] [-s <bytes>]\n", argv[0]);
+  fprintf(stderr, "Usage: %s -h <host> -p <port> [-l] [-r] [-t <udp|tor>] [-c <count>] [-i <ms>] [-s <bytes>]\n", argv[0]);
   exit(EXIT_FAILURE);
 }