diff --git a/KN05/x_res/custom-vpc.md b/KN05/x_res/custom-vpc.md
index e9e6a85..25af15f 100644
--- a/KN05/x_res/custom-vpc.md
+++ b/KN05/x_res/custom-vpc.md
@@ -39,5 +39,8 @@ VPC: **M346-XXX-VPC**
 
 ## Challenge C)
 
-### Security Group for Web-Access
-Name: **M346-XXX-Web-Access**
\ No newline at end of file
+### Security Group for Instance in the Public-Subnet (Web-Access)
+Name: **M346-XXX-Web-Access**
+
+### Security Group for Instance in the Private-Subnet (Private-only)
+Name: **M346-XXX-Priv-Only**
\ No newline at end of file