diff --git a/include/core/landmark/landmark_base.h b/include/core/landmark/landmark_base.h
index 7fec21eaf3ad252817d224b9a4e2a111b38ccecd..4860e39de640ec761899e0cc92722ae11ad88678 100644
--- a/include/core/landmark/landmark_base.h
+++ b/include/core/landmark/landmark_base.h
@@ -28,7 +28,7 @@ class LandmarkBase : public NodeBase, public HasStateBlocks, public std::enable_
     private:
         MapBaseWPtr map_ptr_;
         FactorBasePtrList constrained_by_list_;
-        std::vector<StateBlockPtr> state_block_vec_; ///< vector of state blocks, in the order P, O.
+        std::vector<StateBlockPtr> state_block_vec_; ///< vector of state blocks, additional to those in the state_block_map from HasStateBlocks.
 
         static unsigned int landmark_id_count_;