diff --git a/bstools/card.py b/bstools/card.py
index 4098de0..608b8af 100644
--- a/bstools/card.py
+++ b/bstools/card.py
@@ -75,7 +75,7 @@ def single(workspace_path, input_file):
 
 
 @cli.command()
-@click.option("--input-file", "-i", required=True, type=click.Path(exists=True))
+@click.option("--subdir", "-i", required=True, type=click.Path(exists=True))
 @click.option("--workspace-path", "-w", required=True, type=click.Path(exists=True))
 def tree(workspace_path, subdir):
     """Retursively walk subdir and generate title cards for all posts"""