add brief mention of re-sharding on vert vs horz scaling page

content/en/hosting/vertical-vs-horizontal.md

@@ -49,6 +49,10 @@ API["API"] --> HAProxy -->  couch2
 
 Since both CHT 3.x and 4.x support this, vertical scaling is an easy, good first step in addressing performance issues in the CHT. 
 
+### Re-sharding
+
+For those self hosting who are looking to maximize their vertically scaled deployment, consider [re-sharding CouchDB](https://docs.couchdb.org/en/stable/config/resharding.html) to have more shards. CouchDB uses 1 core to manage each shard.  By default, a CHT Core 4.x deployment will have 8 shards.  If you have available unused CPUs, by re-sharding you divide up CouchDB's shard management to take advantage of more cores. 
+
 ## Horizontal scaling 4.x
 
 When: