diff --git a/generic_rag/app.py b/generic_rag/app.py
index 1cf35d3..5bc87d3 100644
--- a/generic_rag/app.py
+++ b/generic_rag/app.py
@@ -28,8 +28,8 @@ parser.add_argument(
     "-p",
     "--pdf-data",
     type=Path,
-    required=True,
     nargs="+",
+    default=[],
     help="One or multiple paths to folders or files to use for retrieval. "
     "If a path is a folder, all files in the folder will be used. "
     "If a path is a file, only that file will be used. "