improve docs

html/index.md

@@ -86,6 +86,8 @@ Apart from a (token-based) dataframe view, there's also an HTML representation o
 
 Every predicted entity (every token, really) gets a black border. The text color signifies the predicted label, with the first token of a sequence of token also showing the label's icon. If (and only if) the prediction is wrong, a small little box after the entity (token) contains the correct target class, with a background color corresponding to that class.
 
+For short texts, the dataframe view can be sufficient, but for longer texts the HTML view tends to be more useful.
+
 
 ### Random Samples