Update README.md

README.md

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 - SpatialLinkage
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 # Dataset Overview
-This dataset is generated for the path synthesis of 1-DOF(degree-of-freedom) closed-loop spatial four-bar linkage mechanisms. Specifically, it contains both open and closed paths together with their corresponding mechanisms. All mechanisms are actuated by revolute (R) joints, and include other various joints, including prismatic (P), cylindrical (C), universal (U), and spherical (S) joints. The dataset covers all possible 1-DOF(degree-of-freedom) closed-loop spatial four-bar mechanism topologies, resulting in a total of 26 distinct topologies.
+This dataset is generated for the path synthesis of 1-DOF(degree-of-freedom) closed-loop spatial four-bar linkage mechanisms. Specifically, it contains **both open and closed paths** together with their corresponding mechanisms. All mechanisms are actuated by revolute (R) joints, and include other various joints, including prismatic (P), cylindrical (C), universal (U), and spherical (S) joints. The dataset covers all possible 1-DOF(degree-of-freedom) closed-loop spatial four-bar mechanism topologies, resulting in a total of 26 distinct topologies.
+
+The database with **closed path** only is uploaded here: https://huggingface.co/datasets/ComputerAidedDesignInnovation/Spatial_Four_Bar_Mechanism_Closed
 
 The corresponding paper is currently under review and will be linked here once published.