diff --git a/README.md b/README.md
index 890c29c..8411ec1 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 Chip 8 emulator/interpreter.
 
 ```bash
-./porcel8 -f an_awesome_chip8_rom.ch8
+./porcel8 an_awesome_chip8_rom.ch8
 ```
 
 ![pong.gif](assets/pong.gif)
diff --git a/src/args.rs b/src/args.rs
index fe57269..1f50402 100644
--- a/src/args.rs
+++ b/src/args.rs
@@ -3,8 +3,8 @@ use clap::Parser;
 #[derive(Parser, Debug, Clone)]
 #[command(version, about, author)]
 pub struct Porcel8ProgramArgs {
-    #[arg(short, long, help = "Filename of ROM to load.")]
-    pub filename: Option<String>,
+    /// CHIP-8 rom file to load
+    pub filename: String,
     #[arg(short, long, help = "Draw scale of window", default_value_t = 8f32)]
     pub draw_scale: f32,
     #[arg(
diff --git a/src/main.rs b/src/main.rs
index b46462a..8f5b4ca 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -94,13 +94,11 @@ fn main() -> EmulatorResult<()> {
     Ok(())
 }
 
-fn start_compute_thread(filename: Option<String>, mut device: Device) -> EmulatorResult<(Sender<()>, JoinHandle<()>)> {
+fn start_compute_thread(filename: String, mut device: Device) -> EmulatorResult<(Sender<()>, JoinHandle<()>)> {
     device.set_default_font();
 
-    if let Some(rom_file_location) = filename {
-        let rom = rom::load_rom(rom_file_location)?;
-        device.load_rom(&rom);
-    }
+    let rom = rom::load_rom(filename)?;
+    device.load_rom(&rom);
 
     let (device_termination_signal_sender, device_termination_signal_sender_receiver) = std::sync::mpsc::channel();
     let compute_handle = thread::Builder::new().name("Compute".to_string()).spawn(move || {