diff --git a/src/TrustRegionBayesianOptimization.jl b/src/TrustRegionBayesianOptimization.jl
index b97cec9..a59c806 100644
--- a/src/TrustRegionBayesianOptimization.jl
+++ b/src/TrustRegionBayesianOptimization.jl
@@ -14,6 +14,9 @@ using AbstractBayesianOptimization
 using SurrogatesAbstractGPs
 using ParameterHandling
 using KernelFunctions
+
+# TODO: switch to QuasiMonteCarlo
+# but does QuasiMonteCarlo support next!(..) interface???
 using Sobol
 
 # building blocks: decision support model & policy