Update choose-ad-authn.md

Author: martincoetzer

articles/active-directory/hybrid/choose-ad-authn.md

@@ -197,7 +197,7 @@ Use or enable password hash synchronization for whichever authentication method
 
 2. **On-premises outage survival**.  The consequences of an on-premises outage due to a cyber-attack or disaster can be substantial, ranging from reputational brand damage to a paralyzed organization unable to deal with the attack. Recently, many organizations were victims of malware attacks, including targeted ransomware, which caused their on-premises servers to go down. When Microsoft helps customers deal with these kinds of attacks, it sees two categories of organizations:
 
-   * Organizations that previously turned on password hash synchronization changed their authentication method to use password hash synchronization. They were back online in a matter of hours. By using access to email via Office 365, they worked to resolve issues and access other cloud-based workloads.
+   * Organizations that previously also turned on password hash synchronization on top of federated or pass-through authentication changed their primary authentication method to then use password hash synchronization. They were back online in a matter of hours. By using access to email via Office 365, they worked to resolve issues and access other cloud-based workloads.
 
    * Organizations that didn’t previously enable password hash synchronization had to resort to untrusted external consumer email systems for communications to resolve issues. In those cases, it took them weeks to restore their on-premises identity infrastructure, before users were able to sign in to cloud-based apps again.