fix

Author: rachel-msft

articles/postgresql/concepts-supported-versions.md

@@ -11,7 +11,7 @@ ms.topic: article
 ms.date: 11/12/2018
 ---
 # Supported PostgreSQL Database Versions
-Microsoft aims to support n-2 versions of the PostgreSQL engine in the Azure Database for PostgreSQL service, meaning the currently released major version (n) and the two prior major versions (-2).
+Microsoft aims to support n-2 versions of the PostgreSQL engine in the Azure Database for PostgreSQL service. That would be the currently released major version on Azure (n) and the two prior major versions (-2).
 
 Azure Database for PostgreSQL currently supports the following versions: