diff --git a/README.md b/README.md
index 0da92c73..7bbaf477 100644
--- a/README.md
+++ b/README.md
@@ -63,12 +63,27 @@ BREAKING CHANGE: use JavaScript features not available in Node 6
 We are using [OpenAPI generator](https://github.com/OpenAPITools/openapi-generator) along with these OAS yaml files to generate our new SDKs.
 
 ## Preview
+### Online
 There are lots of tools available for viewing and editing OpenAPI descriptions in a nicely formatted way. A popular tool is SwaggerHub - a version of which is [hosted here](https://app.swaggerhub.com/home). 
 
 Once you sign up or login, you can create a new API under your account and import a Xero API spec.
 
 ![SwaggerUI Example](images/import-api.png)
 
+### Local
+
+#### Node.js
+If you have Node.js you can use the Swagger UI via an NPM package (it will open a webpage in your default browser):
+`npx -y open-swagger-ui --open ./xero_accounting.yaml`
+
+#### Docker
+To view a local file via Docker, run:
+`docker run -p 8080:8080 -e SWAGGER_JSON=/local/xero_accounting.yaml -v $PWD:/local docker.swagger.io/swaggerapi/swagger-ui`
+
+To view a hosted file via Docker, run:
+`docker run -p 8080:8080 -e SWAGGER_JSON_URL=https://raw.githubusercontent.com/XeroAPI/Xero-OpenAPI/refs/heads/master/xero_accounting.yaml docker.swagger.io/swaggerapi/swagger-ui`
+
+
 ## Updates
 If you find something missing or incorrect please [open an issue](https://github.com/XeroAPI/Xero-OpenAPI/issues/new) or send us a pull request.
 
diff --git a/xero-webhooks.yaml b/xero-webhooks.yaml
index caba199b..750448ac 100644
--- a/xero-webhooks.yaml
+++ b/xero-webhooks.yaml
@@ -1,6 +1,6 @@
 openapi: 3.1.1
 info:
-  description: The Xero Webhooks API exposes event notifications relating to entities in the Xero Public API and can be used for a variety of purposes.
+  description: The Xero Webhooks API exposes event notifications relating to entities in the Xero Public API and can be used for a variety of purposes
   title: Xero Webhooks API
   version: 9.2.0
   termsOfService: https://developer.xero.com/xero-developer-platform-terms-conditions/
@@ -9,8 +9,9 @@ info:
     email: api@xero.com
     url: https://developer.xero.com
 servers:
-  - description: The Xero Webhooks API exposes event notifications relating to entities in the Xero Public API and can be used for a variety of purposes.
+  - description: The Xero Webhooks API exposes event notifications relating to entities in the Xero Public API and can be used for a variety of purposes
     url: https://api.xero.com
+security: []
 webhooks:
   invoices:
     post:
@@ -97,17 +98,41 @@ components:
                 description: The date and time that event occurred (UTC time)
               eventType:
                 type: string
-                description: The type of event of that occurred (e.g. Update)
+                description: The type of event of that occurred (e.g. UPDATE)
+                oneOf:
+                  - type: string
+                    const: CREATE
+                    description: When a new resource is created
+                  - type: string
+                    const: UPDATE
+                    description: When an existing resource is updated (including when they are archived)
               eventCategory:
                 type: string
-                description: The category of event that occurred (e.g. CONTACT). You will only retrieve events from categories that your webhook is subscribed to.
+                description: The category of event that occurred (e.g. CONTACT). You will only retrieve events from categories that your webhook is subscribed to
+                oneOf:
+                  - type: string
+                    const: CONTACT
+                    description: For organisation contact-related events
+                  - type: string
+                    const: INVOICE
+                    description: For organisation invoice-related events
+                  - type: string
+                    const: SUBSCRIPTION
+                    description: For application subscription-related events
               tenantId:
                 type: string
                 format: uuid
                 description: The ID of the tenant that the event happened in relation to (OrganisationID or ApplicationID)
               tenantType:
                 type: string
-                description: The type of tenant, depending on the type of event it will be one of ORGANISATION (for Contact or Invoice events), or APPLICATION (for Subscription events)
+                description: The type of tenant
+                oneOf:
+                  - type: string
+                    const: ORGANISATION
+                    description: Represents a Xero organisation (for non-Subscription events)
+                  - type: string
+                    const: APPLICATION
+                    description: Represents a Xero application (for Subscription events)
             required:
               - resourceUrl
               - resourceId
@@ -116,20 +141,20 @@ components:
               - eventCategory
               - tenantId
               - tenantType
-          description: A list of events that have occurred.
+          description: A list of events that have occurred
         lastEventSequence:
           type: integer
           minimum: 1
           maximum: 2147483647
-          description: The sequence number of the last event in the list.
+          description: The sequence number of the last event in the list
         firstEventSequence:
           type: integer
           minimum: 1
           maximum: 2147483647
-          description: The sequence number of the first event in the list.
+          description: The sequence number of the first event in the list
         entropy:
           type: string
-          description: A random string used for security or validation purposes.
+          description: A random string used for security or validation purposes
   responses:
     401InvalidWebhookData:
       description: Return a 401 status to indicate that the webhook subscription failed