Add initial implementation of expiration watcher

1 files changed, 2 insertions, 0 deletions

diff --git a/packages/0x.js/src/types.ts b/packages/0x.js/src/types.ts
index 11b5d8569..45b49e148 100644
--- a/packages/0x.js/src/types.ts
+++ b/packages/0x.js/src/types.ts
@@ -397,9 +397,11 @@ export interface JSONRPCPayload {
 }
 
 /*
+ * orderExpirationCheckingIntervalMs: How often to check for expired orders
  * eventPollingIntervalMs: How often to poll the Ethereum node for new events
  */
 export interface OrderStateWatcherConfig {
+    orderExpirationCheckingIntervalMs?: number;
     eventPollingIntervalMs?: number;
 }