diff --git a/src/main.c b/src/main.c
index 8a63117..853f172 100644
--- a/src/main.c
+++ b/src/main.c
@@ -146,7 +146,7 @@ int main (
 
 // usage message
 int print_usage(){
-  fprintf(stderr, "usage:\n       nstrophy [-t nthreads] [-p parameters] [-g driving_force] [-i initial_condition] <command>\n\n");
+  fprintf(stderr, "usage:\n       nstrophy [-t nthreads] [-p parameters] [-g driving_force] [-i initial_condition] [-s savefile] <command>\n\n");
   return(0);
 }