diff --git a/README.rst b/README.rst
index fc38869..52bd4b4 100644
--- a/README.rst
+++ b/README.rst
@@ -12,8 +12,8 @@ specified in the RFC), there is an optional dependency on `cryptography <https:/
   import requests
   from requests_http_signature import HTTPSignatureAuth
   preshared_secret = 'monorail_cat'
-  url = 'http://httpbin.org/get'
-  requests.get(url, auth=HTTPSignatureAuth(key=preshared_secret))
+  url = 'http://example.com/path'
+  requests.get(url, auth=HTTPSignatureAuth(key=preshared_secret, key_id='squirrel'))
 
 In addition to signing messages in the client, the class method ``HTTPSignatureAuth.verify()`` can be used to verify
 incoming requests:
diff --git a/requests_http_signature/__init__.py b/requests_http_signature/__init__.py
index 190e1b6..eb4f46e 100644
--- a/requests_http_signature/__init__.py
+++ b/requests_http_signature/__init__.py
@@ -44,7 +44,7 @@ class HTTPSignatureAuth(requests.auth.AuthBase):
         "ecdsa-sha256",
     }
 
-    def __init__(self, key, key_id="hmac-key-1", algorithm="hmac-sha256", headers=None, passphrase=None):
+    def __init__(self, key, key_id, algorithm="hmac-sha256", headers=None, passphrase=None):
         assert algorithm in self.known_algorithms
         self.key = key
         self.key_id = key_id
@@ -65,6 +65,7 @@ class HTTPSignatureAuth(requests.auth.AuthBase):
             digest = self.hasher_constructor(request.body).digest()
             request.headers["Digest"] = "SHA-256=" + base64.b64encode(digest).decode()
 
+    @classmethod
     def get_string_to_sign(self, request, headers):
         sts = []
         for header in headers:
@@ -92,6 +93,7 @@ class HTTPSignatureAuth(requests.auth.AuthBase):
         request.headers["Authorization"] = "Signature " + ",".join('{}="{}"'.format(k, v) for k, v in sig_struct)
         return request
 
+    @classmethod
     def verify(self, request, key_resolver):
         assert "Authorization" in request.headers, "No Authorization header found"
         msg = 'Unexpected scheme found in Authorization header (expected "Signature")'
diff --git a/test/test.py b/test/test.py
index 0e0081d..4bcdc7d 100755
--- a/test/test.py
+++ b/test/test.py
@@ -20,7 +20,7 @@ class TestAdapter(HTTPAdapter):
             if "pubkey" in request.headers:
                 return base64.b64decode(request.headers["pubkey"])
             return hmac_secret
-        HTTPSignatureAuth(key=hmac_secret).verify(request, key_resolver=key_resolver)
+        HTTPSignatureAuth.verify(request, key_resolver=key_resolver)
         response = requests.Response()
         response.status_code = requests.codes.ok
         response.url = request.url
@@ -34,15 +34,16 @@ class TestRequestsHTTPSignature(unittest.TestCase):
 
     def test_basic_statements(self):
         url = 'http://example.com/path?query#fragment'
-        self.session.get(url, auth=HTTPSignatureAuth(key=hmac_secret))
+        self.session.get(url, auth=HTTPSignatureAuth(key=hmac_secret, key_id="sekret"))
         with self.assertRaises(AssertionError):
-            self.session.get(url, auth=HTTPSignatureAuth(key=hmac_secret[::-1]))
+            self.session.get(url, auth=HTTPSignatureAuth(key=hmac_secret[::-1], key_id="sekret"))
 
     def test_rfc_example(self):
         url = 'http://example.org/foo'
         payload = {"hello": "world"}
         date = "Tue, 07 Jun 2014 20:51:35 GMT"
         auth = HTTPSignatureAuth(key=hmac_secret,
+                                 key_id="sekret",
                                  headers=["(request-target)", "host", "date", "digest", "content-length"])
         self.session.post(url, json=payload, headers={"Date": date}, auth=auth)
 
@@ -65,7 +66,7 @@ class TestRequestsHTTPSignature(unittest.TestCase):
             format=serialization.PublicFormat.SubjectPublicKeyInfo
         )
         url = 'http://example.com/path?query#fragment'
-        auth = HTTPSignatureAuth(algorithm="rsa-sha256", key=private_key_pem, passphrase=passphrase)
+        auth = HTTPSignatureAuth(algorithm="rsa-sha256", key=private_key_pem, key_id="sekret", passphrase=passphrase)
         self.session.get(url, auth=auth, headers=dict(pubkey=base64.b64encode(public_key_pem)))
 
 if __name__ == '__main__':