diff --git a/smac/optimizer/acquisition.py b/smac/optimizer/acquisition.py
index 472812fdd..b0114494a 100644
--- a/smac/optimizer/acquisition.py
+++ b/smac/optimizer/acquisition.py
@@ -526,6 +526,10 @@ def __init__(self,
 
         r"""Do a Thompson Sampling for a given x over the best so far value as
         acquisition value.
+
+        Thompson Sampling can only be used together with smac.optimizer.ei_optimization.RandomSearch, please do not
+        use smac.optimizer.ei_optimization.LocalAndSortedRandomSearch to optimize TS acquisition function!!!
+
         :math:`TS(X) ~ \mathcal{N}(\mu(\mathbf{X}),\sigma(\mathbf{X}))'
         Returns -TS(X) as the acquisition_function optimizer maximizes the acquisition value.
         Parameters