diff --git a/Overview.md b/Overview.md
index beefa99..b484e3a 100644
--- a/Overview.md
+++ b/Overview.md
@@ -13,12 +13,27 @@ dofile("Singe/Framework.singe")
 -- Declare any global variables you need here.
 
 function onControllerMoved(axis, value, which)
+  --[[
+    Reports which controller axis was moved as well as it's current value.
+    (Range: -32768 to 32767)  This is used for analog devices.  Digial input
+    is handled by onInput and onKey.
+  --]]
 end
 
 function onInputPressed(what)
+  --[[
+    When in keyboard MODE_NORMAL, input events are reported here when the
+    key or button is first depressed.  For a full list of keys/buttons/controllers,
+    see Singe/Framework.singe.
+  --]]
 end
 
 function onInputReleased(what)
+  --[[
+    When in keyboard MODE_NORMAL, input events are reported here when the
+    key or button is released.  For a full list of keys/buttons/controllers,
+    see Singe/Framework.singe.
+  --]]
 end
 
 function onKeyPressed(key, scancode)
@@ -28,16 +43,32 @@ function onKeyReleased(key, scancode)
 end
 
 function onMouseMoved(x, y, xr, yr, which)
+  --[[
+    Called when the mouse is moved.
+    When in SINGLE_MOUSE mode, absolute X & Y values as well as the
+    relative change in position is returned.  For MANY_MOUSE mode, only
+    the relative change is available as well as which mouse was moved.
+  --]]
 end
 
 function onOverlayUpdate()
-   return(OVERLAY_UPDATED)  -- Or OVERLAY_NOT_UPDATED if no drawing was done.
+  --[[
+    This is the only place you can safely perform drawing operations!
+    If you wish to display a targeting cursor, you will need to save the
+    mouse position from onMouseMoved in global variables and then use those
+    here to render the cursor.
+  --]]
+
+  -- Tell Singe if we changed the display or not. 
+  return(OVERLAY_UPDATED)  -- Or OVERLAY_NOT_UPDATED if no drawing was done.
 end
 
 function onShutdown()
+  -- Called when the user exits your game.  Free loaded resources here.
 end
 
-function onSoundCompleted(channel)
+function onSoundCompleted(id)
+  -- The sound "id" just finished playing.
 end
 
 -- Note:  There is no "onStartup" event.