diff --git a/py-packages/spiller/spiller/__init__.py b/py-packages/spiller/spiller/__init__.py
index 3d4c8c2..297ca7e 100644
--- a/py-packages/spiller/spiller/__init__.py
+++ b/py-packages/spiller/spiller/__init__.py
@@ -40,7 +40,7 @@ def get_opts():
         "--data-file",
         action="store",
         type=argparse.FileType("r"),
-        help="Read the data to store from a file. Must use this or [data]. Will strip newlines at the end.",
+        help="Read the data to store from a file. Must use this or [data]. Will strip newlines at the end. Use filename - for stdin",
     )
     set_parser.add_argument("--plain", action="store_true", default=False, help="Do not encrypt")
     set_parser.add_argument(