Update doc to explain 'Why is this being added directly to the Signon'

docs/homepage.md

@@ -23,6 +23,10 @@ We do not store the secrets generated by this command and just rely on the secre
 
 ### Questions
 
+#### Why is this being added directly to the Signon landing page?
+
+The functionality itself will sit within Mainstream Publisher. However, we’ve made the decision to take an experimental approach and show the Homepage link within the main signon page. We’ve decided to trial this as we believe that users should simply be able to select what action they want to perform, rather than having to understand what app they need to use to accomplish a task. There are some challenges to this approach as it differs to the way we normally approach the navigation within our apps, but the homepage edit permission will be limited to a small group of users, so we feel it’s a low risk way to learn more about this approach through user testing.
+
 #### Which schema in publishing api does popular links use?
 
 link_collection