diff --git a/src/Client/ClientInterface.php b/src/Client/ClientInterface.php
index 6fa3321..e49fd4a 100644
--- a/src/Client/ClientInterface.php
+++ b/src/Client/ClientInterface.php
@@ -11,6 +11,7 @@
 
 interface ClientInterface
 {
+    const HTTP_HEAD = 'HEAD';
     const HTTP_GET = 'GET';
     const HTTP_POST = 'POST';
     const HTTP_DELETE = 'DELETE';