diff --git a/ecml_tools/commands/copy.py b/ecml_tools/commands/copy.py
index 6236cd1..7181f22 100644
--- a/ecml_tools/commands/copy.py
+++ b/ecml_tools/commands/copy.py
@@ -49,6 +49,7 @@ def add_arguments(self, command_parser):
             command_parser.add_argument("--block-size", type=int, default=100)
             command_parser.add_argument("--overwrite", action="store_true")
             command_parser.add_argument("--progress", action="store_true")
+            command_parser.add_argument("--nested", action="store_true")
             command_parser.add_argument(
                 "--rechunk",
                 nargs="+",