diff --git a/packages/protocol/src/types.ts b/packages/protocol/src/types.ts
index 8fa46645..b0c483b7 100644
--- a/packages/protocol/src/types.ts
+++ b/packages/protocol/src/types.ts
@@ -342,5 +342,6 @@ export type OrderStatusData = {
 export type CloseData = {
   /** an explanation of why the exchange is being closed */
   reason?: string
+  /** indicates whether or not the exchange successfully completed */
+  success?: string
 }
-