Trying to clarify the distinction between Public and the other fixed server roles

davidbaxterbrowne · web-flow · commit 67c9c74f8b17 · 2018-08-31T09:32:02.000-05:00
Trying to clarify the distinction between server roles with fixed permissions, and Public which has fixed membership and non-fixed permissions.
diff --git a/docs/relational-databases/system-catalog-views/sys-server-principals-transact-sql.md b/docs/relational-databases/system-catalog-views/sys-server-principals-transact-sql.md
@@ -44,7 +44,7 @@ monikerRange: ">=aps-pdw-2016||>=sql-server-2016||=sqlallproducts-allversions||>
 |**default_language_name**|**sysname**|Default language for this principal.|  
 |**credential_id**|**int**|ID of a credential associated with this principal. If no credential is associated with this principal, credential_id will be NULL.|  
 |**owning_principal_id**|**int**|The **principal_id** of the owner of a server role. NULL if the principal is not a server role.|  
-|**is_fixed_role**|**bit**|Returns 1 if the principal is one of the fixed server roles. For more information, see [Server-Level Roles](../../relational-databases/security/authentication-access/server-level-roles.md).|  
+|**is_fixed_role**|**bit**|Returns 1 if the principal is one of the built-in server roles with fixed permissions. For more information, see [Server-Level Roles](../../relational-databases/security/authentication-access/server-level-roles.md).|  
   
 ## Permissions  
  Any login can see their own login name, the system logins, and the fixed server roles. To see other logins, requires ALTER ANY LOGIN, or a permission on the login. To see user-defined server roles, requires ALTER ANY SERVER ROLE, or membership in the role.  
@@ -55,7 +55,7 @@ monikerRange: ">=aps-pdw-2016||>=sql-server-2016||=sqlallproducts-allversions||>
  The following query lists the permissions explicitly granted or denied to server principals.  
   
 > [!IMPORTANT]  
->  The permissions of fixed server roles do not appear in sys.server_permissions. Therefore, server principals may have additional permissions not listed here.  
+>  The permissions of fixed server roles (other than Public) do not appear in sys.server_permissions. Therefore, server principals may have additional permissions not listed here.  
   
 ```  
 SELECT pr.principal_id, pr.name, pr.type_desc,   
