diff --git a/README.md b/README.md
index 13ed7a9..8d8ec09 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ docker run --rm -v $(pwd):/pwd ghcr.io/reteps/dockerfmt:latest /pwd/tests/in/run
 ## Usage
 
 ```output
-A updated version of the dockfmt. Uses the dockerfile parser from moby/buildkit and the shell formatter from mvdan/sh.
+A updated version of the dockfmt. Uses the dockerfile parser from moby/buildkit and the shell formatter from mvdan/sh. If no Dockerfile arguments specified will process input from the stdin.
 
 Usage:
   dockerfmt [Dockerfile...] [flags]
diff --git a/cmd/root.go b/cmd/root.go
index d38b367..9c19fa7 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -22,7 +22,7 @@ var (
 var rootCmd = &cobra.Command{
 	Use:   "dockerfmt [Dockerfile...]",
 	Short: "dockerfmt is a Dockerfile and RUN step formatter.",
-	Long:  `A updated version of the dockfmt. Uses the dockerfile parser from moby/buildkit and the shell formatter from mvdan/sh.`,
+	Long:  `A updated version of the dockfmt. Uses the dockerfile parser from moby/buildkit and the shell formatter from mvdan/sh. If no Dockerfile arguments specified will process input from the stdin.`,
 	Run:   Run,
 	Args:  cobra.ArbitraryArgs,
 }