diff --git a/index.d.ts b/index.d.ts
index 65a19e94..77140705 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -17,9 +17,9 @@ interface IOptions {
   ios: {
     appName: string,
     imageName?: string,
-    supportsVideo: false,
-    maximumCallGroups: '1',
-    maximumCallsPerCallGroup: '1'
+    supportsVideo?: boolean,
+    maximumCallGroups?: string,
+    maximumCallsPerCallGroup?: string,
     ringtoneSound?: string,
   },
   android: {