diff --git a/src/codex32/errors.py b/src/codex32/errors.py
index 03fce90..f0c5cb9 100644
--- a/src/codex32/errors.py
+++ b/src/codex32/errors.py
@@ -18,14 +18,12 @@ def _error(name: str, base: type[CodexError], doc: str) -> type[CodexError]:
 UnknownProfile = _error("UnknownProfile", CodexError, "The HRP is not a registered profile.")
 InvalidChecksum = _error("InvalidChecksum", CodexError, "The outer checksum does not validate.")
 
-InvalidHeader = _error("InvalidHeader", CodexError, "The six-symbol header is invalid.")
-InvalidThreshold = _error("InvalidThreshold", InvalidHeader, "The threshold is not 0 or 2 through 9.")
-InvalidIdentifier = _error("InvalidIdentifier", InvalidHeader, "The identifier is not four symbols.")
-InvalidShareIndex = _error("InvalidShareIndex", InvalidHeader, "The share index conflicts with its header.")
-
-InvalidPayload = _error("InvalidPayload", CodexError, "The payload is not permitted by its profile.")
-InvalidPadding = _error("InvalidPadding", InvalidPayload, "The discarded payload padding is invalid.")
-InvalidBip39Checksum = _error("InvalidBip39Checksum", InvalidPayload, "The BIP39 checksum is invalid.")
+InvalidThreshold = _error("InvalidThreshold", CodexError, "The threshold is not 0 or 2 through 9.")
+InvalidIdentifier = _error("InvalidIdentifier", CodexError, "The identifier is not four symbols.")
+InvalidShareIndex = _error("InvalidShareIndex", CodexError, "The share index conflicts with its header.")
+
+InvalidPadding = _error("InvalidPadding", CodexError, "The discarded payload padding is invalid.")
+InvalidBip39Checksum = _error("InvalidBip39Checksum", CodexError, "The BIP39 checksum is invalid.")
 
 InvalidShareSet = _error("InvalidShareSet", CodexError, "Artifacts cannot form an interpolation set.")
 WrongShareCount = _error("WrongShareCount", InvalidShareSet, "The share count differs from its threshold.")