diff --git a/docgen/content-sources/HOME.md b/docgen/content-sources/HOME.md
index c89df0a57..00d2090a0 100644
--- a/docgen/content-sources/HOME.md
+++ b/docgen/content-sources/HOME.md
@@ -1,3 +1,8 @@
 # Firebase Functions SDK Reference
 
-Functions SDK!!!
+The `firebase-functions` package provides an SDK for defining Cloud Functions for Firebase.
+
+To get started using Cloud Functions, see
+[Get started: write, test, and deploy your first functions](/docs/functions/get-started).
+
+For source code, see the [Cloud Functions for Firebase GitHub repo](https://github.com/firebase/firebase-functions).
diff --git a/docgen/content-sources/toc.yaml b/docgen/content-sources/toc.yaml
index 856b12640..91544d4f6 100644
--- a/docgen/content-sources/toc.yaml
+++ b/docgen/content-sources/toc.yaml
@@ -90,6 +90,8 @@ toc:
     section:
       - title: 'HttpsError'
         path: /docs/reference/functions/providers_https_.httpserror.html
+      - title: 'CallableContext'
+        path: /docs/reference/functions/providers_https_.callablecontext.html
 
   - title: 'functions.pubsub'
     path: /docs/reference/functions/providers_pubsub_.html
diff --git a/src/providers/https.ts b/src/providers/https.ts
index 36077affd..605c633f0 100644
--- a/src/providers/https.ts
+++ b/src/providers/https.ts
@@ -28,6 +28,7 @@ import { apps } from '../apps';
 import { HttpsFunction, optionsToTrigger, Runnable } from '../cloud-functions';
 import { DeploymentOptions } from '../function-configuration';
 
+/** @hidden */
 export interface Request extends express.Request {
   rawBody: Buffer;
 }
@@ -127,6 +128,7 @@ export type FunctionsErrorCode =
   | 'data-loss'
   | 'unauthenticated';
 
+/** @hidden */
 export type CanonicalErrorCodeName =
   | 'OK'
   | 'CANCELLED'
@@ -146,6 +148,7 @@ export type CanonicalErrorCodeName =
   | 'UNAVAILABLE'
   | 'DATA_LOSS';
 
+/** @hidden */
 interface HttpErrorCode {
   canonicalName: CanonicalErrorCodeName;
   status: number;
@@ -180,6 +183,7 @@ const errorCodeMap: { [name in FunctionsErrorCode]: HttpErrorCode } = {
   'data-loss': { canonicalName: 'DATA_LOSS', status: 500 },
 };
 
+/** @hidden */
 interface HttpErrorWireFormat {
   details?: unknown;
   message: string;
@@ -261,19 +265,22 @@ export interface CallableContext {
   rawRequest: Request;
 }
 
-// The allowed interface for an http request for a callable function.
+// The allowed interface for an HTTP request to a Callable function.
+/** @hidden*/
 interface HttpRequest extends Request {
   body: {
     data: any;
   };
 }
 
-// The format for the http body response to a callable function.
+/** @hidden */
+// The format for an HTTP body response from a Callable function.
 interface HttpResponseBody {
   result?: any;
   error?: HttpsError;
 }
 
+/** @hidden */
 // Returns true if req is a properly formatted callable request.
 function isValidRequest(req: Request): req is HttpRequest {
   // The body must not be empty.
@@ -317,7 +324,9 @@ function isValidRequest(req: Request): req is HttpRequest {
   return true;
 }
 
+/** @hidden */
 const LONG_TYPE = 'type.googleapis.com/google.protobuf.Int64Value';
+/** @hidden */
 const UNSIGNED_LONG_TYPE = 'type.googleapis.com/google.protobuf.UInt64Value';
 
 /**
@@ -400,6 +409,7 @@ export function decode(data: any): any {
   return data;
 }
 
+/** @hidden */
 const corsHandler = cors({ origin: true, methods: 'POST' });
 
 /** @hidden */
diff --git a/src/setup.ts b/src/setup.ts
index 6a0796348..b30fa6226 100644
--- a/src/setup.ts
+++ b/src/setup.ts
@@ -20,6 +20,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
+/** @hidden */
 import { firebaseConfig } from './config';
 
 // Set up for config and vars
diff --git a/src/utilities/assertions.ts b/src/utilities/assertions.ts
index 49ff5e36d..982ca304d 100644
--- a/src/utilities/assertions.ts
+++ b/src/utilities/assertions.ts
@@ -1,4 +1,4 @@
-/**
+/** @hidden
  * @file Provides common assertion helpers which can be used to improve
  * strictness of both type checking and runtime.
  */
diff --git a/src/utilities/path.ts b/src/utilities/path.ts
index 40ab8f047..33e187f9e 100644
--- a/src/utilities/path.ts
+++ b/src/utilities/path.ts
@@ -1,4 +1,4 @@
-/**
+/** @hidden
  * Removes leading and trailing slashes from a path.
  *
  * @param path A path to normalize, in POSIX format.
diff --git a/src/utils.ts b/src/utils.ts
index b52c1e54f..e41b1e1fb 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -20,6 +20,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
+/** @hidden */
 import * as _ from 'lodash';
 
 export function applyChange(src: any, dest: any) {