diff --git a/src/Omnipay/WorldpayCGHosted/Message/Notification.php b/src/Omnipay/WorldpayCGHosted/Message/Notification.php
index b66a702..c27f818 100644
--- a/src/Omnipay/WorldpayCGHosted/Message/Notification.php
+++ b/src/Omnipay/WorldpayCGHosted/Message/Notification.php
@@ -3,7 +3,7 @@
 namespace Omnipay\WorldpayCGHosted\Message;
 
 use DOMDocument;
-use Omnipay\Common\Exception\InvalidResponseException;
+use Omnipay\Common\Exception\InvalidRequestException;
 use Omnipay\Common\Message\AbstractResponse;
 
 /**
@@ -28,23 +28,23 @@ class Notification extends AbstractResponse
     /** @noinspection PhpMissingParentConstructorInspection
      * @param string                $data
      * @param string                $notificationOriginIp
-     * @throws InvalidResponseException on missing data
+     * @throws InvalidRequestException on missing or invalid data
      */
     public function __construct($data, $notificationOriginIp)
     {
         $this->originIp = $notificationOriginIp;
 
         if (empty($data)) {
-            throw new InvalidResponseException();
+            throw new InvalidRequestException('Notification data empty');
         }
 
         if (!is_string($data)) {
-            throw new InvalidResponseException('Data must be provided as a string');
+            throw new InvalidRequestException('Notification data not a string');
         }
 
         $responseDom = new DOMDocument;
         if (!@$responseDom->loadXML($data)) {
-            throw new InvalidResponseException('Non-XML notification body received');
+            throw new InvalidRequestException('Notification data not loaded as XML');
         }
 
         $document = simplexml_import_dom($responseDom->documentElement);
@@ -139,7 +139,8 @@ public function getResponseStatusCode()
     }
 
     /**
-     * Indicates whether the given origin IP address matches *.worldpay.com based on reverse DNS.
+     * Indicates whether the given origin IP address matches *.worldpay.com based on reverse DNS, or IP as a fallback
+     * on containers that can't gethostbyaddr().
      *
      * @return bool
      */
diff --git a/src/Omnipay/WorldpayCGHosted/Message/Response.php b/src/Omnipay/WorldpayCGHosted/Message/Response.php
index 52491bf..e7d4c1b 100755
--- a/src/Omnipay/WorldpayCGHosted/Message/Response.php
+++ b/src/Omnipay/WorldpayCGHosted/Message/Response.php
@@ -29,7 +29,7 @@ public function __construct(RequestInterface $request, $data)
 
         $responseDom = new DOMDocument;
         if (!@$responseDom->loadXML($data)) {
-            throw new InvalidResponseException('Non-XML notification response received');
+            throw new InvalidResponseException('Non-XML response received');
         }
 
         $this->data = @simplexml_import_dom(
diff --git a/tests/Omnipay/WorldpayCGHosted/Message/NotificationTest.php b/tests/Omnipay/WorldpayCGHosted/Message/NotificationTest.php
index 1854f39..9ede692 100644
--- a/tests/Omnipay/WorldpayCGHosted/Message/NotificationTest.php
+++ b/tests/Omnipay/WorldpayCGHosted/Message/NotificationTest.php
@@ -219,8 +219,8 @@ public function testRefundRequest()
     }
 
     /**
-     * @expectedException \Omnipay\Common\Exception\InvalidResponseException
-     * @expectedExceptionMessage Non-XML notification body received
+     * @expectedException \Omnipay\Common\Exception\InvalidRequestException
+     * @expectedExceptionMessage Notification data not loaded as XML
      */
     public function testNonXmlResponse()
     {
@@ -251,8 +251,8 @@ public function testUnexpectedXmlBody()
     }
 
     /**
-     * @expectedException \Omnipay\Common\Exception\InvalidResponseException
-     * @expectedExceptionMessage Invalid response from payment gateway
+     * @expectedException \Omnipay\Common\Exception\InvalidRequestException
+     * @expectedExceptionMessage Notification data empty
      */
     public function testEmptyData()
     {