diff --git a/Structural/Adapter/README.rst b/Structural/Adapter/README.rst
index 12be447..6698fda 100644
--- a/Structural/Adapter/README.rst
+++ b/Structural/Adapter/README.rst
@@ -30,7 +30,7 @@ You can also find these code on `GitHub`_
 
 BookInterface.php
 
-.. literalinclude:: PaperBookInterface.php
+.. literalinclude:: BookInterface.php
    :language: php
    :linenos: