diff --git a/src/Output/DiagramOutput.php b/src/Output/DiagramOutput.php
index 0359eb4..c68aa32 100644
--- a/src/Output/DiagramOutput.php
+++ b/src/Output/DiagramOutput.php
@@ -9,7 +9,7 @@
 namespace JerryYan\DSL\Output;
 
 
-class DiagramOutput extends OutputInterface
+class DiagramOutput //extends OutputInterface
 {
 
 }
\ No newline at end of file
diff --git a/src/Output/HTMLOutput.php b/src/Output/HTMLOutput.php
index 2d16480..7b2bb49 100644
--- a/src/Output/HTMLOutput.php
+++ b/src/Output/HTMLOutput.php
@@ -9,7 +9,7 @@
 namespace JerryYan\DSL\Output;
 
 
-class HTMLOutput extends OutputInterface
+class HTMLOutput //extends OutputInterface
 {
 
 }
\ No newline at end of file