diff --git a/types/opentok/index.d.ts b/types/opentok/index.d.ts
index d41e50b3e5..4667324d2e 100644
--- a/types/opentok/index.d.ts
+++ b/types/opentok/index.d.ts
@@ -1,6 +1,7 @@
 // Type definitions for opentok v2.3.2
 // Project: https://github.com/opentok/opentok-node
 // Definitions by: Seth Westphal <https://github.com/westy92>
+//                 Anthony Messerschmidt <https://github.com/CatGuardian>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 declare module 'opentok' {
@@ -61,6 +62,7 @@ declare module 'opentok' {
     export interface ListArchivesOptions {
       count?: number;
       offset?: number;
+      sessionId?: string;
     }
   }
 
diff --git a/types/opentok/opentok-tests.ts b/types/opentok/opentok-tests.ts
index c6cdfbca66..e1df18c6ea 100644
--- a/types/opentok/opentok-tests.ts
+++ b/types/opentok/opentok-tests.ts
@@ -51,6 +51,7 @@ client.deleteArchive('ARCHIVE_ID', (err: Error) => {
 const listArchivesOptions: OpenTok.ListArchivesOptions = {
   count: 10,
   offset: 5,
+  sessionId: '9_JY17LWC6LeKsGQ2-DXQlBac32PLwRSI7TV0FKOIDEX0PsmejJOGhrRtAW3PWABpEW3C-cp',
 }
 
 client.listArchives(listArchivesOptions, (err: Error, archives: OpenTok.Archive[], totalCount: number) => {