diff --git a/API b/API
index 431f40a..ddfa744 100644
--- a/API
+++ b/API
@@ -96,6 +96,11 @@ API has utility functions for transfer nodes to easily call every node function
 	-- the can_take_* functions should always be called before using the get_*_size, get_*_name, get_*_stack or take_* functions on an inventory node
 
 API has utility functions for standard inventory nodes to easily implement the API
+	-- pos parameter can be:
+		-- {x=<X>, y=<Y>, z=<Z>}
+		-- {type="node", pos={x=<X>, y=<Y>, z=<Z>}}
+		-- {type="detached", name="<name>"}
+		-- {type="player", name="<name>"}
 
 	node_io.compare_itemstack(itemstack1, itemstack2) -> bool
 		-- returns true if both itemstacks are identical, excluding count