diff --git a/fileprefix.py b/fileprefix.py
index 49f52c0..dc8198c 100644
--- a/fileprefix.py
+++ b/fileprefix.py
@@ -21,6 +21,7 @@ IGNORE_EXTENSIONS = ['py', 'lnk', 'ini']
 
 def natural_sorter(x):
     '''
+    Thank you Mark Byers
     http://stackoverflow.com/a/11150413
     '''
     convert = lambda text: int(text) if text.isdigit() else text.lower()