diff --git a/src/lib.rs b/src/lib.rs
index 8a20cb9..c72fe70 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -44,11 +44,18 @@ pub enum PdError {
     /// Set sink path rejected
     SetSinkPath,
     /// The requested action has not yet completed
-    InProgress,
+    Busy,
+    /// The requested action timed out
+    Timeout,
+    /// Generic failure
+    Failed,
+    /// The device is in the incorrect mode
+    InvalidMode,
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 /// Top-level error type
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error<BE> {
     /// Bus error
     Bus(BE),