diff --git a/rna_tools/rna_standardize.py b/rna_tools/rna_standardize.py
index d5f05f28b..fa9d9f039 100755
--- a/rna_tools/rna_standardize.py
+++ b/rna_tools/rna_standardize.py
@@ -1,14 +1,12 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-
 """rna_standardize.py - standardzie RNA PDB structures
 
 Usage::
 
-   $ rna_standardize.py
+   $ rna_standardize.py <pdb file>
 
 -v is for verbose, --version for version ;)
-
 """
 import argparse
 import textwrap