diff --git a/src/mango.c b/src/mango.c
index 9f02b17..ea36753 100644
--- a/src/mango.c
+++ b/src/mango.c
@@ -5877,5 +5877,5 @@ int main(int argc, char *argv[]) {
 	return EXIT_SUCCESS;
 
 usage:
-	die("Usage: %s [-v] [-d] [-s startup command]", argv[0]);
+	die("Usage: %s [-v] [-d] [-c config file] [-s startup command]", argv[0]);
 }