Credit the original TopoDiff dataset

README.md

@@ -209,7 +209,7 @@ The training and evaluation scripts are available in the [code repository](https
 
 ## Data Source
 
-The topology examples are based on the SIMP dataset described in Section 4.1 of the paper. HPG-Diff adds displacement and principal stress line features for physics-guided generation.
+The SIMP topology examples come from [TopoDiff](https://decode.mit.edu/projects/topodiff/) by François Mazé and Faez Ahmed. HPG-Diff supplements them with displacement and principal stress line features.
 
 ## Citation
 

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