diff --git a/matlab/size_of_the_reduced_form_model.m b/matlab/size_of_the_reduced_form_model.m
index 53239b4a5..b573ba0c7 100644
--- a/matlab/size_of_the_reduced_form_model.m
+++ b/matlab/size_of_the_reduced_form_model.m
@@ -1,4 +1,5 @@
 function mega = size_of_the_reduced_form_model(dr)
+% Computes the size of dr.
 
 % Copyright (C) 2008 Dynare Team
 %