diff --git a/main.go b/main.go
index f36c0a2..be2d8be 100644
--- a/main.go
+++ b/main.go
@@ -15,6 +15,7 @@ var execCmd string
 
 func main() {
 	flag.BoolVar(&dryrun, "n", false, "Show what would have been done.")
+	force := flag.Bool("force", false, "Actually rename files.")
 	flag.StringVar(&execCmd, "exec", "", "Run command on matching file.")
 	path := flag.String("path", ".", "Handle files in path.")
 	flag.Parse()
@@ -24,8 +25,8 @@ func main() {
 		return
 	}
 
-	if !dryrun {
-		panic("please dry run first")
+	if !dryrun && !*force {
+		panic("please dry run first or use the force flag to actually rename files")
 	}
 
 	switch flag.Arg(0) {