Update README.md

Author: jackbrookes

README.md

@@ -30,7 +30,7 @@ If you have developed a project using UXF please [let me know](http://twitter.co
 
 UXF automates the process of collecting data.
 
-**Behavioural data** is collected with 1 row per `Trial`, and automatically records some values such as the timestamp of the start and end of the trial.
+**Behavioural data** is collected with 1 row per `Trial`, and automatically records some values such as the timestamp of the start and end of the trial. Developers can easily record observations of any type and associate them with a trial. Data is output with one row per trial in a results csv file.
 
 **Continuous data** is data that is measured contunously over time during a trial. The main use case of this is to track the position and rotation of any object in the scene, which is captured at whatever frame rate the application is running at (in the `Update()` loop) by adding a `PositionRotationTracker` component to a GameObject. This can be used to track positions of user controlled objects (such as hands or head in a virtual reality application) or an arbitrary object in the scene (e.g. some kind of stimuli). However this system is generic and developers can create their own `Tracker` classes that perform measurements of any variable during trials.