diff --git a/tools/stats/column_maker.py b/tools/stats/column_maker.py
index 054eadbd85e..a9e2fc78854 100644
--- a/tools/stats/column_maker.py
+++ b/tools/stats/column_maker.py
@@ -1,13 +1,13 @@
 #!/usr/bin/env python
 # This tool takes a tab-delimited textfile as input and creates another column in the file which is the result of
 # a computation performed on every row in the original file.  The tool will skip over invalid lines within the file,
-# informing the user about the number of lines skipped.  
-import sys, re, os.path
-from galaxy import eggs
-from galaxy.tools import validation
-from galaxy.datatypes import metadata
+# informing the user about the number of lines skipped.
+
+import sys, re
+# These functions may be used in compute expression:
 from math import log,exp,sqrt,ceil,floor
 
+
 assert sys.version_info[:2] >= ( 2, 4 )
 
 def stop_err( msg ):