diff --git a/cli.js b/cli.js
index f4df290..3bb8087 100755
--- a/cli.js
+++ b/cli.js
@@ -9,12 +9,12 @@ const fileType = require('file-type');
 const cli = meow(`
 	Usage
 	  $ open-cli <file|url> [--wait] [--background] [-- <app> [args]]
-	  $ cat <file> | open-cli [--ext] [--wait] [--background] [-- <app> [args]]
+	  $ cat <file> | open-cli [--extension] [--wait] [--background] [-- <app> [args]]
 
 	Options
 	  --wait         Wait for the app to exit
 	  --background   Do not bring the app to the foreground (macOS only)
-	  --ext          File extension for when stdin file type can't be detected
+	  --extension    File extension for when stdin file type can't be detected
 
 	Examples
 	  $ open-cli https://sindresorhus.com
@@ -22,7 +22,7 @@ const cli = meow(`
 	  $ open-cli https://sindresorhus.com -- 'google chrome' --incognito
 	  $ open-cli unicorn.png
 	  $ cat unicorn.png | open-cli
-	  $ echo '<h1>Unicorns!</h1>' | open-cli --ext=html
+	  $ echo '<h1>Unicorns!</h1>' | open-cli --extension=html
 `, {
 	flags: {
 		wait: {
@@ -33,7 +33,7 @@ const cli = meow(`
 			type: 'boolean',
 			default: false
 		},
-		ext: {
+		extension: {
 			type: 'string'
 		}
 	}
@@ -48,13 +48,13 @@ if (!input && process.stdin.isTTY) {
 	process.exit(1);
 }
 
-if (input) {
-	open(input, cli.flags);
-} else {
-	(async () => {
+(async () => {
+	if (input) {
+		await open(input, cli.flags);
+	} else {
 		const stdin = await getStdin.buffer();
 		const type = fileType(stdin);
-		const ext = cli.flags.ext || (type && type.ext) || 'txt';
-		open(tempWrite.sync(stdin, `open.${ext}`), cli.flags);
-	})();
-}
+		const extension = cli.flags.extension || (type && type.ext) || 'txt';
+		await open(tempWrite.sync(stdin, `open.${extension}`), cli.flags);
+	}
+})();
diff --git a/readme.md b/readme.md
index 53d1468..fca0235 100644
--- a/readme.md
+++ b/readme.md
@@ -17,12 +17,12 @@ $ open-cli --help
 
   Usage
     $ open-cli <file|url> [--wait] [--background] [-- <app> [args]]
-    $ cat <file> | open-cli [--ext] [--wait] [--background] [-- <app> [args]]
+    $ cat <file> | open-cli [--extension] [--wait] [--background] [-- <app> [args]]
 
   Options
     --wait         Wait for the app to exit
     --background   Do not bring the app to the foreground (macOS only)
-    --ext          File extension for when stdin file type can't be detected
+    --extension    File extension for when stdin file type can't be detected
 
   Examples
     $ open-cli https://sindresorhus.com
@@ -30,7 +30,7 @@ $ open-cli --help
     $ open-cli https://sindresorhus.com -- 'google chrome' --incognito
     $ open-cli unicorn.png
     $ cat unicorn.png | open-cli
-    $ echo '<h1>Unicorns!</h1>' | open-cli --ext=html
+    $ echo '<h1>Unicorns!</h1>' | open-cli --extension=html
 ```
 
 The [following file types](https://github.com/sindresorhus/file-type#supported-file-types) are automagically detected when using stdin mode.