diff --git a/megiaudioroute.c b/megiaudioroute.c
index 4a67507..e6ad42b 100644
--- a/megiaudioroute.c
+++ b/megiaudioroute.c
@@ -377,6 +377,11 @@ int main(int ac, char* av[])
 			break;
 		default: /* '?' */
 			fprintf(stderr, "Usage: %s [-s] [-m] [-h] [-e] [-2]\n", av[0]);
+			fprintf(stderr, "\t-s\tSpeaker On\n");
+			fprintf(stderr, "\t-m\tMicrophone On\n");
+			fprintf(stderr, "\t-h\tHeadphones On\n");
+			fprintf(stderr, "\t-e\tEarpiece On\n");
+			fprintf(stderr, "\t-2\t???\n");
 			exit(EXIT_FAILURE);
 		}
 	}