Fix a typo
diff --git a/src/args.c b/src/args.c
index 0ce07ec..e04e74c 100644
--- a/src/args.c
+++ b/src/args.c
@@ -167,7 +167,7 @@
 			case '?':
 			default:
 			{
-				// We don't set invalid, so we won't print a message.
+				// We don't set err, so we won't print a message.
 				s = BC_STATUS_ERROR;
 				break;
 			}