diff --git a/matlab/tfgm/utils/db.m b/matlab/tfgm/utils/db.m
index dd0ccf488de1cde98e0ae9ec67e9aaa5939df726..5832d74a126bba2352ddd191ec3ddc75c13bf726 100644
--- a/matlab/tfgm/utils/db.m
+++ b/matlab/tfgm/utils/db.m
@@ -1,6 +1,12 @@
 function x_db = db(x)
 %% x_db = db(x)
-% Converts the elements of x to decibels (dB).
+% Linear to decibel (dB) conversion
+% Inputs 
+%     - x : scalar or nd-array
+%           Values to be converted
+% Output        
+%        x_db (scalar or nd-array) : conversion of input 'x' in dB.
+%
 % Author: Marina KREME
 %%
 x_db = 20*log10(abs(x));