diff --git a/mkswap.c b/mkswap.c
index 28fea33..8349333 100644
--- a/mkswap.c
+++ b/mkswap.c
@@ -24,7 +24,7 @@ struct swap_hdr {
 static void
 usage(void)
 {
-	eprintf("usage: %s <filename|device>\n", argv0);
+	eprintf("usage: %s swapfile\n", argv0);
 }
 
 int