diff --git a/package.json b/package.json
index ab9cb6b..b09560f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "bnc-sdk",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "SDK to connect to the blocknative backend via a websocket connection",
   "keywords": [
     "ethereum",
diff --git a/src/interfaces.ts b/src/interfaces.ts
index e94a0df..0312e56 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -188,6 +188,7 @@ export type TransactionEventCode =
   | 'txSendFail'
   | 'txError'
   | 'txUnderPriced'
+  | 'txDropped'
   | 'all'
 
 export interface Ac {
diff --git a/src/utilities.ts b/src/utilities.ts
index 9580f63..8a1372d 100644
--- a/src/utilities.ts
+++ b/src/utilities.ts
@@ -13,11 +13,20 @@ export function createEmitter(): Emitter {
         case 'txSpeedUp':
         case 'txCancel':
         case 'txFailed':
+        case 'txDropped':
+        case 'txRequest':
+        case 'nsfFail':
+        case 'txRepeat':
+        case 'txAwaitingApproval':
+        case 'txConfirmReminder':
+        case 'txSendFail':
+        case 'txError':
+        case 'txUnderPriced':
         case 'all':
           break
         default:
           throw new Error(
-            `${eventCode} is not a valid event code, for a list of valid event codes see: https://github.com/blocknative/sdk`
+            `${eventCode} is not a valid event code, for a list of valid event codes see: https://docs.blocknative.com/notify-sdk#event-codes`
           )
       }