doc updates

Author: jansenbe

docs/solution-guidance/portal-overview.md

@@ -9,8 +9,9 @@ localization_priority: Priority
 
 SharePoint on-premises has been, and is, a popular platform for building enterprise portals (also known as intranets). You can build similar portals on SharePoint Online as well. However, because SharePoint Online is different from an infrastructure architecture point of view, it's important to factor in the SharePoint Online-specific performance considerations when developing your new portal. This set of articles gives you guidance on the key portal design areas.
 
-> [!NOTE] 
-> Although this guidance primarily targets SharePoint Online, most of it also applies to portals hosted in an on-premises SharePoint environment.
+> [!NOTE]
+> - Although this guidance primarily targets SharePoint Online, most of it also applies to portals hosted in an on-premises SharePoint environment.
+> - Ensuring the portal you design is healthy and does achieve the performance you desire is important, another recommended read is the [Creating and launching a healthy SharePoint portal](https://docs.microsoft.com/en-us/sharepoint/portal-health) documentation which covers both classic and modern portals.
 
 ## Why we created these guidelines
 
@@ -58,4 +59,5 @@ The following table contains an overview of the individual articles that are par
 
 ## See also
 
+- [Creating and launching a healthy SharePoint portal](https://docs.microsoft.com/en-us/sharepoint/portal-health)
 - [Office 365 development and SharePoint PnP solution guidance](office-365-development-patterns-and-practices-solution-guidance.md)