diff --git a/src/lib.rs b/src/lib.rs
index 98bb1ae..172102a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -68,13 +68,12 @@ where
 
 /// Indicates different error conditions.
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
+#[non_exhaustive]
 pub enum Error {
     BadStartBit,
     BadStopBit,
     ParityError,
     UnknownKeyCode,
-    #[doc(hidden)]
-    InvalidState,
 }
 
 /// Keycodes that can be generated by a keyboard.
@@ -646,6 +645,12 @@ impl Ps2Decoder {
     }
 }
 
+impl Default for Ps2Decoder {
+    fn default() -> Self {
+        Ps2Decoder::new()
+    }
+}
+
 impl<L> EventDecoder<L>
 where
     L: KeyboardLayout,
diff --git a/src/scancodes/set1.rs b/src/scancodes/set1.rs
index 4775eb2..4c7dbf8 100644
--- a/src/scancodes/set1.rs
+++ b/src/scancodes/set1.rs
@@ -313,6 +313,12 @@ impl ScancodeSet for ScancodeSet1 {
     }
 }
 
+impl Default for ScancodeSet1 {
+    fn default() -> Self {
+        ScancodeSet1::new()
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
diff --git a/src/scancodes/set2.rs b/src/scancodes/set2.rs
index 4dcc9d6..5f74ab7 100644
--- a/src/scancodes/set2.rs
+++ b/src/scancodes/set2.rs
@@ -266,6 +266,12 @@ impl ScancodeSet for ScancodeSet2 {
     }
 }
 
+impl Default for ScancodeSet2 {
+    fn default() -> Self {
+        ScancodeSet2::new()
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;