Update app.py

app.py

@@ -276,10 +276,12 @@ if __name__=='__main__':
     input: smiles of one compound, such as CC(OCC)=O,   and the ratio of five solvents, example: 20 1 0 0 0 for PE:EA=20:1\n
     output: the predicted Rf value.\n\n
     ## Citation\n
-    Please cite our work if it does help you:\n
-    H. Xu, J. Lin, Q. Liu, Y. Chen, J. Zhang, Y. Yang, M.C. Young, Y. Xu, D. Zhang, F. Mo
+    We would like appreciate if you use our software and give us credit in acknowledgement section of your paper：
+    We used Rf prediction software in our synthesis work.[Citation1, Citation2]\n
+    Citation1: H. Xu, J. Lin, Q. Liu, Y. Chen, J. Zhang, Y. Yang, M.C. Young, Y. Xu, D. Zhang, F. Mo
     High-throughput discovery of chemical structure-polarity relationships combining automation and machine-learning techniques
-    Chem (2022), 3202–3214, 10.1016/j.chempr.2022.08.008
+    Chem (2022), 3202–3214, 10.1016/j.chempr.2022.08.008\n
+    Citation2: https://huggingface.co/spaces/woshixuhao/Rf_compare
     """