We usually like to put button names within tics, for example `ButtonName`, to make them stand out.  
Maybe you could change the wording a bit? For example:

**Main page**

* Displays the list of contacts.
* Contains a seach bar for the contact list.
* Provides a `Details` button to display a detailed list.
* Displays contact details when you click on a contact.
* Provides a `Menu` button in the upper left corner that opens a menu.