diff --git a/docs/unsure-where-to-put/federation-architecture.md b/docs/unsure-where-to-put/federation-architecture.md
index 6d4d2c7a4b..271b87de3b 100644
--- a/docs/unsure-where-to-put/federation-architecture.md
+++ b/docs/unsure-where-to-put/federation-architecture.md
@@ -44,6 +44,7 @@ classDiagram
       Path             string
       Host             string
       Port             string
+      Source           string
       UnvalidatedInput string
       Validate() []string
     }