diff --git a/python/obitools3/commands/ngsfilter.pyx b/python/obitools3/commands/ngsfilter.pyx
index 22ee76e..9ffdf01 100644
--- a/python/obitools3/commands/ngsfilter.pyx
+++ b/python/obitools3/commands/ngsfilter.pyx
@@ -24,10 +24,6 @@ from cpython.exc cimport PyErr_CheckSignals
 from io import BufferedWriter
 
 
-#REVERSE_SEQ_COLUMN_NAME = b"REVERSE_SEQUENCE"      # used by alignpairedend tool
-#REVERSE_QUALITY_COLUMN_NAME = b"REVERSE_QUALITY"   # used by alignpairedend tool
-
-
 __title__="Assigns sequence records to the corresponding experiment/sample based on DNA tags and primers"