diff --git a/doc/developer-guides/hld/hld-security.rst b/doc/developer-guides/hld/hld-security.rst
index da7d7c91c..bfd770f73 100644
--- a/doc/developer-guides/hld/hld-security.rst
+++ b/doc/developer-guides/hld/hld-security.rst
@@ -825,10 +825,10 @@ configuration.
 
 To save page tables and share the mappings for non-secure world address
 space, the hypervisor relocates the Secure World's GPA to a very high
-position: 512G-513G. Hence, the PML4 for Trusty World are separated from
-non-secure World. PDPT/PD/PT for low memory (<512G) are shared in both
+position: 511G-512G. Hence, the PML4 for Trusty World are separated from
+non-secure World. PDPT/PD/PT for low memory (<511G) are shared in both
 Trusty World's EPT and non-secure World's EPT. PDPT/PD/PT for high
-memory (>=512G) are valid for Trusty World's EPT only.
+memory (>=511G) are valid for Trusty World's EPT only.
 
 .. figure:: images/security-image8.png
    :width: 900px
diff --git a/doc/developer-guides/hld/images/security-image8.png b/doc/developer-guides/hld/images/security-image8.png
index 1463e7c7c..e76b9c956 100644
Binary files a/doc/developer-guides/hld/images/security-image8.png and b/doc/developer-guides/hld/images/security-image8.png differ