diff --git a/types/index.d.ts b/types/index.d.ts
index 9ba21ce..81c3aa4 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -4,9 +4,9 @@ export default VuePdfViewer;
 
 export interface VuePdfViewerProps {
   source: object | string;
-  controls: string[];
-  loadingText: string;
-  renderingText: string;
+  controls?: string[];
+  loadingText?: string;
+  renderingText?: string;
 }
 export interface VuePdfViewerData {
   isLoading: boolean,