diff --git a/website/source/api/catalog.html.md b/website/source/api/catalog.html.md
index c1907d6d5..73d689d29 100644
--- a/website/source/api/catalog.html.md
+++ b/website/source/api/catalog.html.md
@@ -54,7 +54,10 @@ The table below shows this endpoint's support for
 - `Service` `(Service: nil)` - Specifies to register a service. If `ID` is not
   provided, it will be defaulted to the value of the `Service.Service` property.
   Only one service with a given `ID` may be present per node. The service
-  `Tags`, `Address`, `Meta`, and `Port` fields are all optional.
+  `Tags`, `Address`, `Meta`, and `Port` fields are all optional. For more
+  infomation about these fields and the implications of setting them, 
+  see the [Service - Agent API](https://www.consul.io/api/agent/service.html) page
+  as registering services differs between using this or the Services Agent endpoint.
 
 - `Check` `(Check: nil)` - Specifies to register a check. The register API
   manipulates the health check entry in the Catalog, but it does not setup the