diff --git a/doorcontrol/hid/Credential.py b/doorcontrol/hid/Credential.py
index 333c479..5bc3248 100644
--- a/doorcontrol/hid/Credential.py
+++ b/doorcontrol/hid/Credential.py
@@ -12,13 +12,13 @@ class InvalidHexCode(Exception):
 
 
 class Not26Bit(InvalidHexCode):
-    def __init__(self) -> None:
-        super().__init__("Card number > 26 bits")
+    def __init__(self, bits: bitstring.Bits) -> None:
+        super().__init__(f"Card number > 26 bits [{bits.hex}]")
 
 
 class InvalidParity(InvalidHexCode):
-    def __init__(self, even_odd: Literal["even", "odd"]) -> None:
-        super().__init__(f"Bad {even_odd} parity")
+    def __init__(self, bits: bitstring.Bits, even_odd: Literal["even", "odd"]) -> None:
+        super().__init__(f"Bad {even_odd} parity [{bits.hex}]")
 
 
 @dataclasses.dataclass(frozen=True)
@@ -41,11 +41,11 @@ class Credential:
         bits = bitstring.Bits(hex=hex_code)
 
         if bits[:6].any(1):
-            raise Not26Bit
+            raise Not26Bit(bits)
         if bits[6] != bits[7:19].count(1) % 2:
-            raise InvalidParity("even")
+            raise InvalidParity(bits, "even")
         if bits[31] != (bits[19:31].count(0) % 2):
-            raise InvalidParity("odd")
+            raise InvalidParity(bits, "odd")
 
         return cls(bits)