diff --git a/src/octokit/__init__.py b/src/octokit/__init__.py
index ed30d66..dc7fd9c 100644
--- a/src/octokit/__init__.py
+++ b/src/octokit/__init__.py
@@ -9,6 +9,7 @@ import requests
 from jose import jwt
 from octokit import errors
 from octokit import utils
+from routes import specifications
 
 page_regex = re.compile(r'[\?\&]page=(\d+)[_&=\w\d]*>; rel="(\w+)"')
 
@@ -164,7 +165,7 @@ class Octokit(Base):
 
     def __init__(self, *args, **kwargs):
         super().__init__()
-        self._create(utils.get_json_data('index.json'))
+        self._create(specifications[kwargs.get('routes', 'api.github.com')])
         self._setup_authentication(kwargs)
         self._attribute_cache = defaultdict(dict)
 
diff --git a/tests/test_octokit.py b/tests/test_octokit.py
index eb69a57..a629370 100644
--- a/tests/test_octokit.py
+++ b/tests/test_octokit.py
@@ -47,3 +47,12 @@ class TestOctokit(object):
         assert next(p) == {'page': 2, 'kwargs': {'param': 'value'}}
         assert next(p) == {'page': 3, 'kwargs': {'param': 'value'}}
         assert next(p) == {'page': 4, 'kwargs': {'param': 'value'}}
+
+    def test_can_speficy_the_route_specifications_used(self):
+        from octokit import Octokit
+        octokit = Octokit(routes='ghe-2.15')
+        assert '/enterprise/2.15' in octokit.issues.create.__doc__
+        octokit = Octokit()
+        assert '/developer.github.com' in octokit.issues.create.__doc__
+        octokit = Octokit(routes='api.github.com')
+        assert '/developer.github.com' in octokit.issues.create.__doc__