Update README.md

README.md

@@ -8,3 +8,13 @@ By default, the mod doesn't add any specific tooltips on its own but other playe
 ### For Builders
 
 To add a tooltip to a UIX Button, simply put a Comment component (Uncategorized -> Comment) on the same slot as the Button component and set its Text to "TooltipperyLabel:Example Text", where Example Text would be replaced with what you want it to show on the tooltip.
+
+### For Modders
+
+If you are making a mod that needs more than just a button with associated tooltip text, this mod provides multiple things:  
+1. The Tooltippery class has a property called labelProviders.  
+This is of type List<Func<Button, ButtonEventData, string>>, and holds a list of functions which, given a Button and ButtonEventData object, can return any string they like, indicating that that should be a label for the Button in question. These are consulted every time the player hovers over a Button.
+2. If you wish to manually open tooltips for some other reason, the Tooltippery class provides both a showTooltip() and a hideTooltip() function.  
+showTooltip()  takes a string, Slot and float3, telling it where to parent the new tooltip and what text to put on it.  
+It then returns a Tooltip object which can be passed to hideTooltip() to close the tooltip again.  
+The Tooltip object also has a setText() function, which you can call to alter the text on the tooltip after it has been created.