diff --git a/windows/security/identity-protection/hello-for-business/hello-cert-trust-validate-ad-prereq.md b/windows/security/identity-protection/hello-for-business/hello-cert-trust-validate-ad-prereq.md
index 6e1445768e..f380bd2aa3 100644
--- a/windows/security/identity-protection/hello-for-business/hello-cert-trust-validate-ad-prereq.md
+++ b/windows/security/identity-protection/hello-for-business/hello-cert-trust-validate-ad-prereq.md
@@ -44,11 +44,12 @@ Windows Hello for Business uses asymmetric keys as user credentials (rather than
 
 Sign-in to the domain controller hosting the schema master operational role using enterprise administrator equivalent credentials.
 
-1. Open an elevated command prompt.
-2. Type ```cd /d x:\support\adprep``` where *x* is the drive letter of the DVD or mounted ISO.
-3. To update the schema, type ```adprep /forestprep```.
-4. Read the Adprep Warning.  Type the letter **C** and press **Enter** to update the schema.
-5. Close the Command Prompt and sign-out.
+1. Mount ISO file (or enter the DVD) of Windows Server 2016 or later installation media.
+2. Open an elevated command prompt.
+3. Type ```cd /d x:\support\adprep``` where *x* is the drive letter of the DVD or mounted ISO.
+4. To update the schema, type ```adprep /forestprep```.
+5. Read the Adprep Warning.  Type the letter **C** and press **Enter** to update the schema.
+6. Close the Command Prompt and sign-out.
 
 ## Create the KeyCredential Admins Security Global Group