Add thousands of sites information

self-host/advanced/increasing-subnet-capacity.mdx

@@ -5,6 +5,10 @@ description: "Understand the Gerbil subnet hierarchy and how to raise the number
 
 Every Gerbil exit node hands out its own persistent WireGuard subnet, and every site or client that connects to that exit node gets its own smaller subnet carved out of it. By default this hierarchy only leaves room for a limited number of sites and clients per exit node. If you're running a large deployment and are hitting that ceiling, you can raise it by changing three related settings in `config.yml`.
 
+<Note>
+Pangolin can support tens of thousands of sites. As you scale the amount of sites, ensure you have sufficient subnet space on your exit nodes and [deploy clustered versions of Pangolin to enable expansion](/self-host/clustering/understanding-clustering).
+</Note>
+
 ## How the subnet hierarchy works
 
 There are three [`gerbil`](/self-host/advanced/config-file#gerbil-tunnel-controller) settings that work together, each nested inside the one before it:

self-host/clustering/requirements.mdx

@@ -9,6 +9,10 @@ Clustering is only available in [Enterprise Edition](/self-host/enterprise-editi
 
 Review these requirements before you start deploying. They cover the hosts you need, the ports that must be open, and the DNS records you need to delegate ahead of time. For background on why each piece exists, see [Understanding Clustering](/self-host/clustering/understanding-clustering).
 
+<Tip>
+Pangolin can support tens of thousands of sites. Ensure you size your cluster properly for the amount of sites you plan to include and their throughput. In general, for low bandwidth sites ~1,000 can fit on a standard single node. [Ensure you choose subnets for your nodes that support the desired number of sites](/self-host/advanced/increasing-subnet-capacity).  
+</Tip>
+
 ## Hosts
 
 You need a minimum of **three hosts**: