diff --git a/src/lib.rs b/src/lib.rs
index a52c3b1..8fad51a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -166,10 +166,12 @@ impl PamServiceModule for PamFido2Luks {
                 args,
             ) {
                 Ok(_) => PamError::SUCCESS,
-                Err(e) => match e {
-                    //TODO: output more detailed error
-                    _ => PamError::AUTH_ERR,
-                },
+                Err(e) => {
+                    eprintln!("{}", e);
+                    match e {
+                        _ => PamError::AUTH_ERR,
+                    }
+                }
             }
         } else {
             PamError::AUTH_ERR