diff --git a/README.md b/README.md
index 9f416b4..3096def 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 Rename multiple files using your `$EDITOR`. The command name is named after _multi-mv_.
 ## Usage
 ```bash
-mmv [files] ...
+mmv file ...
 ```
 This command opens the editor with the list of file names so edit and write.
 The command finds the changed lines and renames all the corresponding files.
diff --git a/cmd/mmv/main.go b/cmd/mmv/main.go
index d386b29..5170915 100644
--- a/cmd/mmv/main.go
+++ b/cmd/mmv/main.go
@@ -41,7 +41,7 @@ func run(args []string) int {
 Version: %s (rev: %s/%s)
 
 Synopsis:
-  %% %[1]s files ...
+  %% %[1]s file ...
 
 Options:
 `, name, version, revision, runtime.Version())
@@ -61,7 +61,7 @@ Options:
 	}
 	args = fs.Args()
 	if len(args) == 0 {
-		fmt.Fprintf(os.Stderr, "usage: %s files ...\n", name)
+		fmt.Fprintf(os.Stderr, "usage: %s file ...\n", name)
 		return exitCodeErr
 	}
 	if err := rename(args); err != nil {