diff --git a/Metallicity_Stack_Commons/column_names.py b/Metallicity_Stack_Commons/column_names.py
index add4205..176db40 100644
--- a/Metallicity_Stack_Commons/column_names.py
+++ b/Metallicity_Stack_Commons/column_names.py
@@ -69,6 +69,7 @@ def line_fit_suffix_add(line_name0, line_type0):
 filename_dict = dict()
 
 # Bin-related files
+filename_dict['comp_spec'] = 'composite_spectra.fits'
 filename_dict['bin_info'] = 'bin_info.tbl'
 filename_dict['bin_valid'] = 'bin_validation.tbl'
 filename_dict['bin_valid_rev'] = 'bin_validation_revised.tbl'