diff --git a/types/main.d.ts b/types/main.d.ts
index 0724dc6..8c9284b 100644
--- a/types/main.d.ts
+++ b/types/main.d.ts
@@ -68,6 +68,16 @@ declare module "pdfjs" {
          */
         info: DocumentProperties & { id: string };
 
+        /**
+         * The documents width.
+         */
+        width: number;
+
+        /**
+         * The documents height.
+         */
+        height: number;
+
         /**
          * Document is a Readable stream and can therefore piped into other streams
          * @param dest destination