diff --git a/doc/source/api/fixture.rst b/doc/source/api/fixture.rst
index 0f9bd8a..9ccc9a8 100644
--- a/doc/source/api/fixture.rst
+++ b/doc/source/api/fixture.rst
@@ -1,8 +1,30 @@
 =========
- fixture
+ Fixture
 =========
 
 .. automodule:: oslo_versionedobjects.fixture
    :members:
    :undoc-members:
 
+ObjectVersionChecker
+~~~~~~~~~~~~~~~~~~~~
+
+Fingerprints
+------------
+
+One function of the ObjectVersionChecker is to generate fingerprints of versioned objects.
+These fingerprints are a combination of the object's version and a hash of the
+RPC-critical attributes of the object: fields and remotable methods.
+
+The test_hashes() method is used to retrieve the expected and actual fingerprints
+of the objects. When using this method to assert the versions of objects in a
+local project, the expected fingerprints are the fingerprints of the previous
+state of the objects. These fingerprints are defined locally in the project and
+passed to test_hashes(). The actual fingerprints are the dynamically-generated
+fingerprints of the current state of the objects. If the expected and actual
+fingerprints do not match on an object, this means the RPC contract that was
+previously defined in the object is no longer the same. Because of this, the
+object's version must be updated. When the version is updated and the tests are
+run again, a new fingerprint for the object is generated. This fingerprint
+should be written over the previous version of the fingerprint. This shows the
+newly generated fingerprint is now the most recent state of the object.