Clarify some things

docs/index.rst

@@ -5,7 +5,7 @@ Mastodon.py
 
 Usage
 -----
-Register your app! This only needs to be done once. Uncomment the code and substitute in your information:
+Register your app! This only needs to be done once (per server, or when distributing rather than hosting an application, most likely per device and server). Uncomment the code and substitute in your information:
 
 .. code-block:: python
 
@@ -19,7 +19,7 @@ Register your app! This only needs to be done once. Uncomment the code and subst
     )
     '''
 
-Then login. This can be done every time, or you can use the persisted information:
+Then, log in. This can be done every time your application starts (e.g. when writing a simple bot), or you can use the persisted information:
 
 .. code-block:: python