diff --git a/select_runs.py b/select_snapshot.py
similarity index 92%
rename from select_runs.py
rename to select_snapshot.py
index 1bb5b4a..032a7f8 100644
--- a/select_runs.py
+++ b/select_snapshot.py
@@ -1,3 +1,10 @@
+# -*- mode: python-mode; python-indent-offset: 4 -*-
+# coding: utf-8
+
+"""
+  Select snaphots with a criterion
+"""
+
 from run_selector import RunSelector
 from plotter import Plotter, U
 import os