diff --git a/SETUP.md b/SETUP.md
index ff69826..ca26b8c 100644
--- a/SETUP.md
+++ b/SETUP.md
@@ -6,8 +6,7 @@ instructions in [BUILD](https://github.com/matrix-construct/construct/wiki/BUILD
 
 #### NOTES
 
-- We will refer to your server as `host.tld`. For those familiar with matrix:
-this is your _origin_ and mxid `@user:host.tld` hostpart. Your `well-known` delegation is not relevant here.
+- We will refer to your server as `host.tld`. For those familiar with matrix: this is your _origin_ and mxid `@user:host.tld` hostpart. If you delegate your server's location to something like `matrix.host.tld:1234` we refer to this as your _servername_.
 
 - If you built construct yourself as a standalone build you will need to add
 the included library directories before executing:
@@ -18,7 +17,7 @@ the included library directories before executing:
 
 1. Execute
 
-	There is one argument: `<origin>` described in the notes above (your `host.tld`).
+	There are two arguments: `bin/construct <origin> [servername]`. If the _servername_ argument is missing, the _origin_ will be used for it instead. For well-known delegations the _servername_ should be different from the _origin_.
 
 	```
 	bin/construct host.tld