diff --git a/schemas/workflow_runs/definitions.yaml b/schemas/workflow_runs/definitions.yaml
index e2787943..c61cf2cc 100644
--- a/schemas/workflow_runs/definitions.yaml
+++ b/schemas/workflow_runs/definitions.yaml
@@ -110,3 +110,7 @@ workflow_run_response:
         message:
           type: string
           description: A textual description of the error.
+    sdk_token:
+      type: string
+      nullable: true
+      description: Client token to use when loading this workflow run in the Onfido SDK.