diff --git a/xero_accounting.yaml b/xero_accounting.yaml
index 01c4059d1..b12436e55 100644
--- a/xero_accounting.yaml
+++ b/xero_accounting.yaml
@@ -23293,9 +23293,9 @@ components:
           description: A unique identifier for the organisation. Potential uses.
           type: string
         Class:
-          description: Organisation Classes describe which plan the Xero organisation is on (e.g. DEMO, TRIAL, PREMIUM)
+          description: Organisation Classes describe which plan the Xero organisation is on (e.g. DEMO, TRIAL, PREMIUM). This set may grow over time; treat unrecognised values as valid.
           type: string
-          enum:
+          x-extensible-enum:
             - DEMO
             - TRIAL
             - STARTER