Update app.py

app.py

@@ -1616,7 +1616,7 @@ if __name__=='__main__':
     ·column_name: select a column type in the dropdown\n
     Output:\n
     ·The predicted retention time for two molecules
-    ·The separation probability (Sp) of two molecules, a higher Sp indicates that the molecules is easy to separate in HPLC under given condition (see Citation 2).\n
+    ·The separation probability (Sp) of two molecules, a higher Sp indicates that the molecules is easy to separate in HPLC under given condition (see Citation 1).\n
     ## Citation\n
     We would appreciate it if you use our software and give us credit in the acknowledgements section of your paper:\n
     we use RF prediction software in our synthesis work. [Citation 1, Citation 2]\n