diff --git a/README.md b/README.md
index 7db6e2d..be9ec73 100644
--- a/README.md
+++ b/README.md
@@ -74,8 +74,6 @@ The implementation of `OrderedMap` uses a combination of:
 
 ## Class Diagram
 
-## Class Diagram
-
 ```mermaid
 classDiagram