diff --git a/src/cli.rs b/src/cli.rs
index 4bae469..1b5d208 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -87,9 +87,9 @@ pub fn extend_creds_device(
 }
 
 pub fn read_password_pin_prefixed(
-    reader: impl Fn() -> Fido2LuksResult<String>,
+    prefixed: impl Fn() -> Fido2LuksResult<String>,
 ) -> Fido2LuksResult<(Option<String>, [u8; 32])> {
-    let read = reader()?;
+    let read = prefixed()?;
     let separator = ':';
     let mut parts = read.split(separator);
     let pin = parts.next().filter(|p| p.len() > 0).map(|p| p.to_string());
@@ -601,14 +601,17 @@ mod test {
 
     #[test]
     fn test_read_password_pin_prefixed() {
+        // 1234:test -> PIN: 1234, password: test
         assert_eq!(
             read_password_pin_prefixed(|| Ok("1234:test".into())).unwrap(),
             (Some("1234".to_string()), util::sha256(&["test".as_bytes()]))
         );
+        // :test -> PIN: None, password: test
         assert_eq!(
             read_password_pin_prefixed(|| Ok(":test".into())).unwrap(),
             (None, util::sha256(&["test".as_bytes()]))
         );
+        // 1234::test -> PIN: 1234, password: :test
         assert_eq!(
             read_password_pin_prefixed(|| Ok("1234::test".into())).unwrap(),
             (
@@ -616,10 +619,12 @@ mod test {
                 util::sha256(&[":test".as_bytes()])
             )
         );
+        // 1234 -> PIN: 1234, password: empty
         assert_eq!(
             read_password_pin_prefixed(|| Ok("1234".into())).unwrap(),
             (Some("1234".to_string()), util::sha256(&["".as_bytes()]))
         );
+        // 1234:test -> PIN: None, password: test
         assert_eq!(
             read_password_pin_prefixed(|| Ok(":test".into())).unwrap(),
             (None, util::sha256(&["test".as_bytes()]))