diff --git a/sarif_cli/traverse.py b/sarif_cli/traverse.py
index 9abdda7..035d824 100644
--- a/sarif_cli/traverse.py
+++ b/sarif_cli/traverse.py
@@ -1,3 +1,5 @@
+""" Sarif tree traversal
+""" 
 import sys
 import os
 import re