Update app.py

app.py

@@ -143,7 +143,7 @@ You can see that the model gets a bit of help with the genre here 😉. Since th
 
 ## XXMAJ? 
 
-You may see some strange tokens in the output. These are tokens used by fastai to indicate particularly things about the text. `xxmaj` is used to indicate the next word begins with a capital in the original text `xxbos`. These can be quite important for helping the model make predictions. As an example, you can try `oliver twist` and `Oliver Twist` and see how the results of the model change. 
+You may see some strange tokens in the output. These are tokens used by fastai to indicate particularly things about the text. `xxmaj` is used to indicate the next word begins with a capital in the original text `xxbos` is used to indicate the beginning of a sentence. These can be quite important for helping the model make predictions. As an example, you can try `oliver twist` and `Oliver Twist` and see how the results of the model change. 
 
 
 ## Background