diff --git a/src/EventHub/EventHub.Autorest/README.md b/src/EventHub/EventHub.Autorest/README.md
index 3a2b5c96dbef..6298dce490a3 100644
--- a/src/EventHub/EventHub.Autorest/README.md
+++ b/src/EventHub/EventHub.Autorest/README.md
@@ -64,6 +64,9 @@ disable-transform-identity-type: true
 flatten-userassignedidentity : false
 
 directive:
+  - from: swagger-document
+    where: $.definitions.AccessKeys.properties.primaryKey
+    transform: $["format"] = "password"
   - where:
       variant: ^Create$|^CreateViaIdentityExpanded$|^Update$|^UpdateViaIdentity$|^CreateViaJsonFilePath$|^CreateViaJsonString$
     remove: true