diff --git a/matlab/tfgm/utils/generate_mask.m b/matlab/tfgm/utils/generate_mask.m
index 42e94e3605f2fc6ad3e5a22890f86049e69c29d8..593add4ba279b35d24f721794a71a7ecc5bb94b4 100644
--- a/matlab/tfgm/utils/generate_mask.m
+++ b/matlab/tfgm/utils/generate_mask.m
@@ -4,8 +4,9 @@ function [mask,varargout] = generate_mask(tf_mat_wideband, tf_mat_loc, alpha, se
 % [original_mask, mask_after_imclose, mask_after_imopen,...,
 %    mask] = generate_mask(tf_mat_wideband, tf_mat_loc, alpha, seuil, radius)
 
-% function that generates a binary mask
-%
+% This function generates a binary mask using math morphology. We used 
+% 'disk' structuring element and a radius is given as input.
+% 
 % Inputs:
 
 %     - tf_mat_wideband:  dgt of target signal