diff --git a/CHANGELOG.md b/CHANGELOG.md
index 835f301..795b37b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 * Added a `gil_relese_mode` parameter to the `CRC32CHash` constructor
   used by all underlying `crc32c` function calls (#51).
+* Added `CRC32CHash.checksum` auxiliary property.
 
 ## [2.6]
 
diff --git a/README.rst b/README.rst
index 2fd941e..5487346 100644
--- a/README.rst
+++ b/README.rst
@@ -59,13 +59,15 @@ It can be set to the following values:
 On top of the ``crc32c`` function,
 a ``CRC32CHash(data=b"", gil_release_mode=-1)`` class is also offered.
 It is modelled after the "hash objects" of the ``hashlib`` module
-of the standard library:
+of the standard library. It also offers a ``checksum`` property:
 
 .. code-block:: python
 
    crc32c_hash = crc32c.CRC32CHash()
    crc32c_hash.update(b'hello')
    crc32c_hash.update(b' world')
+   print(crc32c_hash.checksum == crc32c.crc32c(b'hello world'))
+   # True
    print(crc32c_hash.digest())
    # b'\xc9\x94e\xaa'
    digest_as_int = int.from_bytes(crc32c_hash.digest(), "big")
diff --git a/src/crc32c/__init__.py b/src/crc32c/__init__.py
index 3cfda47..63507af 100644
--- a/src/crc32c/__init__.py
+++ b/src/crc32c/__init__.py
@@ -36,6 +36,13 @@ def name(self) -> str:
         """
         return "crc32c"
 
+    @property
+    def checksum(self) -> int:
+        """
+        The checksum calculated so far. Not part of the hashlib interface.
+        """
+        return self._checksum
+
     def __init__(self, data: Buffer = b"", gil_release_mode: int = -1) -> None:
         """
         Initialise the hash object with an optional bytes-like object.
diff --git a/test/test_crc32c.py b/test/test_crc32c.py
index dd4875a..060dbb8 100644
--- a/test/test_crc32c.py
+++ b/test/test_crc32c.py
@@ -174,6 +174,7 @@ def test_copy(self) -> None:
     class TestSpecificValues:
         @staticmethod
         def _check_values(crc32c_hash: crc32c.CRC32CHash, crc: int) -> None:
+            assert crc32c_hash.checksum == crc
             assert int.from_bytes(crc32c_hash.digest(), "big") == crc
             assert len(crc32c_hash.digest()) == 4
             assert int(crc32c_hash.hexdigest(), 16) == crc