diff --git a/src/Guzzle/Plugin/Cache/CachePlugin.php b/src/Guzzle/Plugin/Cache/CachePlugin.php
index d9a2d84a..e16b4225 100644
--- a/src/Guzzle/Plugin/Cache/CachePlugin.php
+++ b/src/Guzzle/Plugin/Cache/CachePlugin.php
@@ -5,6 +5,7 @@ namespace Guzzle\Plugin\Cache;
 use Guzzle\Cache\CacheAdapterInterface;
 use Guzzle\Common\Event;
 use Guzzle\Common\Exception\InvalidArgumentException;
+use Guzzle\Common\Version;
 use Guzzle\Http\Message\RequestInterface;
 use Guzzle\Http\Message\Response;
 use Guzzle\Cache\DoctrineCacheAdapter;
@@ -149,6 +150,9 @@ class CachePlugin implements EventSubscriberInterface
     public function onRequestBeforeSend(Event $event)
     {
         $request = $event['request'];
+
+        $request->addHeader('Via', sprintf('%s GuzzleCache/%s', $request->getProtocolVersion(), Version::VERSION));
+
         if (!$this->canCache->canCacheRequest($request)) {
             return;
         }
@@ -197,6 +201,8 @@ class CachePlugin implements EventSubscriberInterface
             }
         }
 
+        $response->addHeader('Via', sprintf('%s GuzzleCache/%s', $request->getProtocolVersion(), Version::VERSION));
+
         if ($this->debugHeaders) {
             if ($request->getParams()->get('cache.lookup') === true) {
                 $response->addHeader('X-Cache-Lookup', 'HIT from GuzzleCache');
diff --git a/tests/Guzzle/Tests/Plugin/Cache/CachePluginTest.php b/tests/Guzzle/Tests/Plugin/Cache/CachePluginTest.php
index 0decfe66..98ba1a22 100644
--- a/tests/Guzzle/Tests/Plugin/Cache/CachePluginTest.php
+++ b/tests/Guzzle/Tests/Plugin/Cache/CachePluginTest.php
@@ -3,6 +3,7 @@
 namespace Guzzle\Tests\Plugin\Cache;
 
 use Guzzle\Common\Event;
+use Guzzle\Common\Version;
 use Guzzle\Cache\DoctrineCacheAdapter;
 use Guzzle\Http\Message\Request;
 use Guzzle\Http\Message\Response;
@@ -198,6 +199,8 @@ class CachePluginTest extends \Guzzle\Tests\GuzzleTestCase
         $this->assertEquals($response[2], $request->getResponse()->getBody(true));
         $this->assertContains('key=', (string) $request->getResponse()->getHeader('X-Guzzle-Cache'));
         $this->assertTrue($request->getResponse()->hasHeader('Age'));
+        $this->assertSame(sprintf('%s GuzzleCache/%s', $request->getProtocolVersion(), Version::VERSION), $request->getHeader('Via', true));
+        $this->assertSame(sprintf('%s GuzzleCache/%s', $request->getProtocolVersion(), Version::VERSION), $request->getResponse()->getHeader('Via', true));
         $this->assertTrue($request->getParams()->get('cache.lookup'));
         $this->assertTrue($request->getParams()->get('cache.hit'));