Update README.md

README.md

@@ -4,6 +4,9 @@ ViewFlow is an Android UI widget providing a horizontally scrollable [ViewGroup]
 
 The component is a [Library Project](http://developer.android.com/guide/developing/eclipse-adt.html#libraryProject). This means that there's no need to copy-paste resources into your own project, simply add the viewflow component as a reference to any project.
 
+## When to use
+This library might be suitable if you have an indeterminate number of views in your viewflow, if instead you have a static numbers of views you ought to look at Fragments and the ViewPager in the Compatibility Library instead.
+
 ## Usage
 
 ### In your layout