diff --git a/src/Potter/Document/DocumentInterface.php b/src/Potter/Document/DocumentInterface.php
new file mode 100644
index 0000000..c604168
--- /dev/null
+++ b/src/Potter/Document/DocumentInterface.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Potter\Document;
+
+interface DocumentInterface
+{
+
+}