More text changes

about.py

@@ -13,14 +13,16 @@ Here we show 5 of these properties and invite the community to submit and develo
 ABOUT_TEXT = """
 
 **How to participate?**
+You must submit predictions for a validation set before submitting predictions for the private test set.
 
-There are two tracks to the competition:
-- Track 1: If you already have a developability model, you can submit your predictions for the GDPa1 dataset.
+There are two options for validation sets:
+- Track 1: If you already have a developability model, you can submit your predictions for the GDPa1 dataset. 
+    Note that for models trained on the Jain dataset (a subset of the GDPa1 dataset), this evaluation will be overoptimistic and the private test set results will likely be lower.
 - Track 2: If you don't have a model, train one using cross-validaiton on the GDPa1 dataset and submit your predictions under the "Cross-validation" option. 
-This will provide you with a more accurate estimate of your model's performance on the private test set.
+    If trained only on this data, this will provide you with a more accurate estimate of your model's performance on the private test set.
 
 Finally, submit your predictions on the heldout private test set. This will not appear on the leaderboard, and will be used to determine the winners at the close of the competition. 
-There may be some points during the competition where we will release current results on the private test set.
+We may release private test set results at intermediate points during the competition.
 
 **How to submit?**