diff --git a/README.md b/README.md
index 3bdd844..64682f9 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,7 @@ Error:   × Failed to open serial port /dev/<DEVICE NAME>
 Granting read/write permissions to all users, should be sufficient to resolve the above issue (note that this is required each time the device is physically reconnected):
 
 ```sh
-chmod a+rw /dev/<DEVICE NAME>
+sudo chmod a+rw /dev/<DEVICE NAME>
 ```
 
 The port will be saved to `espflash_ports.toml`. For further information, refer to the [`espflash` documentation](https://github.com/esp-rs/espflash/blob/1daf446a0a553d23309e77c8781679ca25fc007a/espflash/README.md).