diff --git a/Readme.org b/Readme.org
index 63e9682..6161f63 100644
--- a/Readme.org
+++ b/Readme.org
@@ -131,7 +131,7 @@ Place =dump2rotorang.py= in the directory containing the LAMMPS trajectory
 files, then run:
 
 #+begin_src sh
-python dump2rotorang.py
+python dump2rotorang.py hoge.lammpstrj
 #+end_src
 
 If trajectory files matching the expected patterns exist, the script will