Update README.md

README.md

@@ -64,6 +64,12 @@ model = SetFitModel.from_pretrained("automatedMotiveCoder/setfit")
 preds = model("I loved the spiderman movie!")
 ```
 
+When using the `predict_proba()` method, the predicted probabilities for
+all classes might not sum to 1. This is because the model loaded uses a
+One-vs-Rest classification approach, which means the model treats each
+class as a binary classification problem. As a result, the probabilities
+are independent, and their sum may exceed or fall below 1.
+
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 ### Downstream Use