adding limitations

introduction.md

@@ -238,7 +238,7 @@ can be a killer app in this context, providing a way to search for images and te
 of photos in digital format. For example, the [Istituto Luce Cinecittà](https://it.wikipedia.org/wiki/Istituto_Luce_Cinecitt%C3%A0) is an Italian governative entity that collects photos of Italy since the
 early 1900 and it is part of the largest movie studios in Europe (Cinecittà). 
 
-# Limitations
+# Limitations and Bias
 
 Currently, the model is not without limits. To mention one, its counting capabilities seem very cool, but from our experiments the model 
 finds difficult to count after three; this is a general limitation.