diff --git a/matlab/dynare_estimation_init.m b/matlab/dynare_estimation_init.m
index 111ab42a057b7e4fc550fe03419d1dfd76a66852..cd07caf073347373af79a5df49d047238297cd54 100644
--- a/matlab/dynare_estimation_init.m
+++ b/matlab/dynare_estimation_init.m
@@ -148,7 +148,7 @@ if ~isempty(estim_params_)
     ub = bounds(:,2);
     bayestopt_.lb = lb;
     bayestopt_.ub = ub;
-else% If estim_params_ is empty...
+else% If estim_params_ is empty (e.g. when running the smoother on a calibrated model)
     xparam1 = [];
     bayestopt_.lb = [];
     bayestopt_.ub = [];