diff --git a/docs/core/exceptions.rst b/docs/core/exceptions.rst
index ed3446cd0b2c..d671f4e02046 100644
--- a/docs/core/exceptions.rst
+++ b/docs/core/exceptions.rst
@@ -1,6 +1,6 @@
 Exceptions
 ==========
 
-.. automodule:: google.api.core.exceptions
+.. automodule:: google.api_core.exceptions
   :members:
   :show-inheritance:
diff --git a/docs/core/helpers.rst b/docs/core/helpers.rst
index 552ad9867c1d..6f72df9561ef 100644
--- a/docs/core/helpers.rst
+++ b/docs/core/helpers.rst
@@ -5,7 +5,7 @@ Helpers
 General Helpers
 ---------------
 
-.. automodule:: google.api.core.general_helpers
+.. automodule:: google.api_core.general_helpers
   :members:
   :show-inheritance:
 
@@ -13,7 +13,7 @@ General Helpers
 Datetime Helpers
 ----------------
 
-.. automodule:: google.api.core.datetime_helpers
+.. automodule:: google.api_core.datetime_helpers
   :members:
   :show-inheritance:
 
@@ -21,6 +21,6 @@ Datetime Helpers
 gRPC Helpers
 ------------
 
-.. automodule:: google.api.core.grpc_helpers
+.. automodule:: google.api_core.grpc_helpers
   :members:
   :show-inheritance:
diff --git a/docs/core/operation.rst b/docs/core/operation.rst
index 662c2d9a7726..c5e676621318 100644
--- a/docs/core/operation.rst
+++ b/docs/core/operation.rst
@@ -1,6 +1,6 @@
 Long-Running Operations
 =======================
 
-.. automodule:: google.api.core.operation
+.. automodule:: google.api_core.operation
   :members:
   :show-inheritance:
diff --git a/docs/core/operations_client.rst b/docs/core/operations_client.rst
index b1ca27fb0c28..be466d3fbf43 100644
--- a/docs/core/operations_client.rst
+++ b/docs/core/operations_client.rst
@@ -1,6 +1,6 @@
 Long-Running Operations Client
 ==============================
 
-.. automodule:: google.api.core.operations_v1
+.. automodule:: google.api_core.operations_v1
   :members:
   :show-inheritance:
diff --git a/docs/core/page_iterator.rst b/docs/core/page_iterator.rst
index 70f4acfd578b..28842da2a76d 100644
--- a/docs/core/page_iterator.rst
+++ b/docs/core/page_iterator.rst
@@ -1,6 +1,6 @@
 Page Iterators
 ==============
 
-.. automodule:: google.api.core.page_iterator
+.. automodule:: google.api_core.page_iterator
   :members:
   :show-inheritance:
diff --git a/docs/core/path_template.rst b/docs/core/path_template.rst
index 2e73cc170230..220779e3ba9f 100644
--- a/docs/core/path_template.rst
+++ b/docs/core/path_template.rst
@@ -1,6 +1,6 @@
 Path Templates
 ==============
 
-.. automodule:: google.api.core.path_template
+.. automodule:: google.api_core.path_template
   :members:
   :show-inheritance:
diff --git a/docs/core/retry.rst b/docs/core/retry.rst
index 1da3f564893c..23a7d70f3431 100644
--- a/docs/core/retry.rst
+++ b/docs/core/retry.rst
@@ -1,6 +1,6 @@
 Retry
 =====
 
-.. automodule:: google.api.core.retry
+.. automodule:: google.api_core.retry
   :members:
   :show-inheritance:
diff --git a/docs/core/timeout.rst b/docs/core/timeout.rst
index 568a4df0cf88..943d42508997 100644
--- a/docs/core/timeout.rst
+++ b/docs/core/timeout.rst
@@ -1,6 +1,6 @@
 Timeout
 =======
 
-.. automodule:: google.api.core.timeout
+.. automodule:: google.api_core.timeout
   :members:
   :show-inheritance:
diff --git a/docs/requirements.txt b/docs/requirements.txt
index f2ff7f181adc..6b4a1dd4aa9e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,7 @@
 setuptools >= 36.4.0
 sphinx >= 1.6.3
 
+api_core/
 core/
 storage/
 bigquery/
diff --git a/nox.py b/nox.py
index 8509d34edea2..c5d783e4f062 100644
--- a/nox.py
+++ b/nox.py
@@ -17,31 +17,6 @@
 import nox
 
 
-ALL_PACKAGES = (
-    'core/',
-    'storage/',
-    'bigquery/',
-    'bigtable/',
-    'datastore/',
-    'dns/',
-    'firestore/',
-    'language/',
-    'logging/',
-    # error_reporting is out of alphabetical order, it depends on logging.
-    'error_reporting/',
-    'monitoring/',
-    'pubsub/',
-    'resource_manager/',
-    'runtimeconfig/',
-    'spanner/',
-    'speech/',
-    'trace/',
-    'translate/',
-    'videointelligence/',
-    'vision/',
-)
-
-
 @nox.session
 def docs(session):
     """Build the docs."""
@@ -54,8 +29,7 @@ def docs(session):
 
     # Install Sphinx and also all of the google-cloud-* packages.
     session.chdir(os.path.realpath(os.path.dirname(__file__)))
-    session.install('Sphinx >= 1.6.3', 'sphinx_rtd_theme')
-    session.install(*ALL_PACKAGES)
+    session.install('-r', os.path.join('docs', 'requirements.txt'))
 
     # Build the docs!
     session.run(