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diff --git a/cryptography/hazmat/primitives/hmac.py b/cryptography/hazmat/primitives/hmac.py
index cd0fd81..1bbe39c 100644
--- a/cryptography/hazmat/primitives/hmac.py
+++ b/cryptography/hazmat/primitives/hmac.py
@@ -39,14 +39,14 @@
def update(self, msg):
if self._ctx is None:
- raise AlreadyFinalized()
+ raise AlreadyFinalized("Context was already finalized")
if isinstance(msg, six.text_type):
raise TypeError("Unicode-objects must be encoded before hashing")
self._ctx.update(msg)
def copy(self):
if self._ctx is None:
- raise AlreadyFinalized()
+ raise AlreadyFinalized("Context was already finalized")
return HMAC(
self._key,
self.algorithm,
@@ -56,8 +56,7 @@
def finalize(self):
if self._ctx is None:
- raise AlreadyFinalized()
-
+ raise AlreadyFinalized("Context was already finalized")
digest = self._ctx.finalize()
self._ctx = None
return digest