diff --git a/Metallicity_Stack_Commons/column_names.py b/Metallicity_Stack_Commons/column_names.py
index 3ad850f..3e5d303 100644
--- a/Metallicity_Stack_Commons/column_names.py
+++ b/Metallicity_Stack_Commons/column_names.py
@@ -46,7 +46,7 @@ def line_fit_suffix_add(line_name0, line_type0):
 # Column names for Gaussian fitting
 # This is just the suffix
 gauss_names0 = ['Flux_Gaussian', 'Flux_Observed', 'S/N', 'Center', 'Norm',
-                'Median', 'Sigma']
+                'Median', 'Sigma', 'RMS']
 balmer_names0 = ['Abs_Norm', 'Abs_Sigma']
 
 # Emission-line fit column names with [LINE] prefix