diff --git a/doc/developer-guides/hld/hld-devicemodel.rst b/doc/developer-guides/hld/hld-devicemodel.rst
index afbf5c66b..a5fd5f1e4 100644
--- a/doc/developer-guides/hld/hld-devicemodel.rst
+++ b/doc/developer-guides/hld/hld-devicemodel.rst
@@ -781,7 +781,7 @@ ACPI Virtualization
 *******************
 
 Introduction
-************
+============
 
 Advanced Configuration and Power Interface (ACPI) provides an open
 standard that operating systems can use to discover and configure