diff --git a/README.md b/README.md
index 7174aedba687..309f2506597f 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ This client supports the following Google Cloud Platform services at a [Beta](#v
 This client supports the following Google Cloud Platform services at an [Alpha](#versioning) quality level:
 * [Google Cloud Speech](#google-cloud-speech-alpha) (Alpha)
 * [Google Stackdriver Trace](#google-stackdriver-trace-alpha) (Alpha)
+* [Google Cloud BigQuery Data Transfer](#google-cloud-bigquerydatatransfer-alpha) (Alpha)
 
 If you need support for other Google APIs, please check out the [Google APIs Client Library for PHP](https://github.com/google/google-api-php-client).
 
@@ -899,6 +900,36 @@ Stackdriver Trace can be installed separately by requiring the `google/cloud-tra
 $ composer require google/cloud-trace
 ```
 
+## Google Cloud BigQuery Data Transfer (Alpha)
+
+- [Source Code](https://github.com/GoogleCloudPlatform/google-cloud-php-bigquerydatatransfer)
+
+**NOTE:** The BigQuery Data Transfer client library is not included in
+google/cloud, and must be installed separately. See below for installation
+instructions.
+
+#### Preview
+
+```php
+require 'vendor/autoload.php';
+
+use Google\Cloud\BigQuery\DataTransfer\V1\DataTransferServiceClient;
+
+$dataTransferServiceClient = new DataTransferServiceClient();
+$projectId = '[MY_PROJECT_ID]';
+$location = 'us-central1';
+$formattedLocation = $dataTransferServiceClient->locationName($projectId, $location);
+$dataSources = $dataTransferServiceClient->listDataSources($formattedLocation);
+```
+
+#### google/cloud-bigquerydatatransfer
+
+Google Cloud BigQuery Data Transfer **must** be installed separately by requiring the `google/cloud-bigquerydatatransfer` composer package:
+
+```
+$ composer require google/cloud-bigquerydatatransfer
+```
+
 ## Caching Access Tokens
 
 By default the library will use a simple in-memory caching implementation, however it is possible to override this behavior by passing a [PSR-6](http://www.php-fig.org/psr/psr-6/) caching implementation in to the desired client.
diff --git a/composer.json b/composer.json
index 92fe07487267..5ddd1ade88db 100644
--- a/composer.json
+++ b/composer.json
@@ -49,8 +49,8 @@
         "monolog/monolog": "~1",
         "psr/http-message": "1.0.*",
         "ramsey/uuid": "~3",
-        "google/proto-client": "0.29.0",
-        "google/gax": "0.28.0"
+        "google/proto-client": "^0.29.0",
+        "google/gax": "^0.28.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8|^5.0",
@@ -87,7 +87,8 @@
         "google/cloud-vision": "0.8.0"
     },
     "suggest": {
-        "phpseclib/phpseclib": "May be used in place of OpenSSL for creating signed Cloud Storage URLs. Please require version ^2."
+        "phpseclib/phpseclib": "May be used in place of OpenSSL for creating signed Cloud Storage URLs. Please require version ^2.",
+        "google/cloud-bigquerydatatransfer": "Client library for the BigQuery Data Transfer API."
     },
     "autoload": {
         "psr-4": {