diff --git a/Document/content/1.1_Preface_and_Contributors.md b/Document/content/1.1_Preface_and_Contributors.md
index 9b3f45a..4774df2 100644
--- a/Document/content/1.1_Preface_and_Contributors.md
+++ b/Document/content/1.1_Preface_and_Contributors.md
@@ -4,7 +4,7 @@
 OWASP AI Testing Guide 
 **Version 1.0 – 2025**
 
-## Preface  
+### Preface  
 
 Artificial Intelligence is transforming how software is designed, deployed, and defended yet our ability to **test, verify, and assure AI systems** has not evolved at the same pace. Traditional application security testing is no longer sufficient for systems driven by models that learn, adapt, and behave unpredictably.  
 
@@ -36,7 +36,7 @@ Onward,
 *Project Co-Leads, OWASP AI Testing Guide*  
 
 
-## AI Testing Guide Authors and Contributors 
+### AI Testing Guide Authors and Contributors 
 
 We would like to thank you all the people involved in the project.