diff --git a/packages/web-embed-api/README.md b/packages/web-embed-api/README.md
index 28152d0..ea19493 100644
--- a/packages/web-embed-api/README.md
+++ b/packages/web-embed-api/README.md
@@ -41,6 +41,7 @@ interface IFormsortWebEmbedConfig {
   authentication?: {
     idToken?: string; // ID Token for authenticated flows
   };
+  origin?: string; // optional -- use if you want to load your flow in a custom damain. e.g. https://acme-flow.com
 }
 ```