diff --git a/whisper-cpp-2023/rust.d/src/main.rs b/whisper-cpp-2023/rust.d/src/main.rs
index a0e2e41..fb16b7c 100644
--- a/whisper-cpp-2023/rust.d/src/main.rs
+++ b/whisper-cpp-2023/rust.d/src/main.rs
@@ -1,7 +1,9 @@
 use whisper_rs::{WhisperContext, FullParams, SamplingStrategy};
 
 fn main() {
-   let mut ctx = WhisperContext::new("../models/ggml-tiny.en.bin").expect("failed to load model");
+   let mut ctx = WhisperContext::new(
+      &std::env::var("MODEL").unwrap_or(String::from("../models/ggml-medium.en.bin"))
+   ).expect("failed to load model");
 
    // create a params object
    let mut params = FullParams::new(SamplingStrategy::Greedy { best_of: 0 });
@@ -16,7 +18,9 @@ fn main() {
    // assume we have a buffer of audio data
    // here we'll make a fake one, floating point samples, 32 bit, 16KHz, mono
    //let audio_data = vec![0_f32; 16000 * 2];
-   let (header, data) = wav::read(&mut std::fs::File::open("../git.d/samples/jfk.wav").expect("failed to open .wav")).expect("failed to decode .wav");
+   let (header, data) = wav::read(&mut std::fs::File::open(
+      &std::env::var("WAV").unwrap_or(String::from("../git.d/samples/jfk.wav"))
+   ).expect("failed to open .wav")).expect("failed to decode .wav");
    assert!(header.channel_count == 1);
    assert!(header.sampling_rate == 16000);
    let data16 = data.as_sixteen().expect("wav is not 32bit floats");