diff --git a/api.lua b/api.lua
index 5f9bbbe..6524727 100644
--- a/api.lua
+++ b/api.lua
@@ -1,17 +1,31 @@
 
+--- Cleaner API
+--
+--  @topic api
+
+
 local replace_items = {}
 local replace_nodes = {}
 
 
+--- Retrieves list of items to be replaced.
+--
+--  @treturn table Items to be replaced.
 function cleaner.get_replace_items()
 	return replace_items
 end
 
+--- Retrieves list of nodes to be replaced.
+--
+--  @treturn table Nodes to be replaced.
 function cleaner.get_replace_nodes()
 	return replace_nodes
 end
 
 
+--- Registers an entity to be removed.
+--
+--  @tparam string src Entity technical name.
 function cleaner.remove_entity(src)
 	core.register_entity(":" .. src, {
 		on_activate = function(self, staticdata)
@@ -20,16 +34,27 @@ function cleaner.remove_entity(src)
 	})
 end
 
+--- Registers a node to be removed.
+--
+--  @tparam string src Node technical name.
 function cleaner.remove_node(src)
 	core.register_node(":" .. src, {
 		groups = {to_remove=1},
 	})
 end
 
+--- Registeres an item to be replaced.
+--
+--  @tparam string src Technical name of item to be replaced.
+--  @tparam string tgt Technical name of item to be used in place.
 function cleaner.replace_item(src, tgt)
 	replace_items[src] = tgt
 end
 
+--- Registers a node to be replaced.
+--
+--  @tparam string src Technical name of node to be replaced.
+--  @tparam string tgt Technical name of node to be used in place.
 function cleaner.replace_node(src, tgt)
 	core.register_node(":" .. src, {
 		groups = {to_replace=1},