diff --git a/DOCUMENTATION.md b/DOCUMENTATION.md
index 97ee217..92fab84 100644
--- a/DOCUMENTATION.md
+++ b/DOCUMENTATION.md
@@ -4,7 +4,7 @@ This documentation is for developers interested in using the GOV.UK Notify PHP c
 
 ## Set up the client
 
-The Notify PHP Client is based on a [PSR-7 HTTP model](https://www.php-fig.org/psr/psr-7/) [external link]. To install it, you must select your preferred HTTP client. You can follow these instructions to use [Guzzle v6 and v5](http://docs.guzzlephp.org/en/stable/) and [cURL](http://php.net/manual/en/book.curl.php) [external links].
+The Notify PHP Client is based on a [PSR-7 HTTP model](https://www.php-fig.org/psr/psr-7/) [external link]. To install it, you must select your preferred PSR-7 compatible HTTP client. You can follow these instructions to use [Guzzle v6 and v5](http://docs.guzzlephp.org/en/stable/)[external link].
 
 ### Guzzle v6
 
@@ -53,31 +53,6 @@ To get an API key, [sign in to GOV.UK Notify](https://www.notifications.service.
 
 To get an API key, [sign in to GOV.UK Notify](https://www.notifications.service.gov.uk/sign-in) and go to the __API integration__ page. You can find more information in the [API keys](#api-keys) section of this documentation.
 
-### cURL
-
-1. Use [Composer](https://getcomposer.org/)  [external link] to install the GOV.UK Notify PHP client. Run the following in the command line:
-
-    ```sh
-    composer require php-http/curl-client php-http/message alphagov/notifications-php-client
-    ```
-
-You can now use the [autoloader](https://getcomposer.org/doc/01-basic-usage.md#autoloading) [external link] to download the GOV.UK Notify PHP client.
-
-1. Add the following code to your application to create a new instance of the client:
-
-    ```
-    $notifyClient = new \Alphagov\Notifications\Client([
-        'apiKey'        => '{your api key}',
-        'httpClient'    => new \Http\Client\Curl\Client(
-            new \Http\Message\MessageFactory\GuzzleMessageFactory,
-            new \Http\Message\StreamFactory\GuzzleStreamFactory
-        ),
-    ]);
-    ```
-
-1. Run `$notifyClient` to access the GOV.UK Notify API.
-
-To get an API key, [sign in to GOV.UK Notify](https://www.notifications.service.gov.uk/sign-in) and go to the __API integration__ page. You can find more information in the [API keys](#api-keys) section of this documentation.
 
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