diff --git a/__crypto/yubikey-rs-demo/src/main.rs b/__crypto/yubikey-rs-demo/src/main.rs
index 9b3df4c..6a38730 100644
--- a/__crypto/yubikey-rs-demo/src/main.rs
+++ b/__crypto/yubikey-rs-demo/src/main.rs
@@ -45,6 +45,8 @@ fn main() -> XResult<()> {
     let reader = readers.iter()?.next().unwrap_or_else(|| failure_and_exit!("No reader!"));
     let mut yubikey = reader.open()?;
 
+    information!("Yubikey serial: {}", yubikey.serial().0);
+
     let esk = EphemeralSecret::random(&mut OsRng);
     let epk = esk.public_key();
     let epk_bytes = EphemeralKeyBytes::from_public_key(&epk);