diff --git a/Document/content/4.0_Appendix_and_References.md b/Document/content/4.0_Appendix_and_References.md
index 7b5b60e..c46de78 100644
--- a/Document/content/4.0_Appendix_and_References.md
+++ b/Document/content/4.0_Appendix_and_References.md
@@ -1,7 +1,7 @@
 
 # **4. Appendixes and References**
 
-## **4.0 Introduction**
+## **Introduction**
 
 This chapter provides all supporting materials that complement the main body of the OWASP AI Testing Guide.
 The appendixes offer structured frameworks, threat models, risk lifecycles, and domain-specific guidance that reinforce the methodology proposed in the guide.