diff --git a/content/schemas/sign_request_signer.yml b/content/schemas/sign_request_signer.yml
index 7e5d655c..072d6127 100644
--- a/content/schemas/sign_request_signer.yml
+++ b/content/schemas/sign_request_signer.yml
@@ -31,6 +31,12 @@ allOf:
             format: date-time
             example: '2021-04-26T08:12:13.982Z'
             description: Date and Time that the decision was made
+          additional_info:
+            type: string
+            example: Requesting changes before signing.
+            description: Additional info about the decision,
+              such as the decline reason from the signer
+            nullable: true
         description: Final decision made by the signer
 
       inputs: