diff --git a/README.md b/README.md
index 0e58e6f..b6f6e6c 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,64 @@ Load nodes from "(world folder)/schems/<file>.we" with position 1 of the current
     //load some random filename
     //load huge_base
 
+WorldEdit API
+-------------
+WorldEdit exposes all significant functionality in a simple interface. Adding WorldEdit to the file "depends.txt" in your mod gives you access to all of the `worldedit` functions. These are useful if you're looking for high-performance node manipulation without all the hassle of writing tons of code.
+
+### worldedit.volume(pos1, pos2)
+
+Determines the volume of the region defined by positions `pos1` and `pos2`.
+
+Returns the volume.
+
+### worldedit.set(pos1, pos2, nodename)
+
+Sets a region defined by positions `pos1` and `pos2` to `nodename`. To clear to region, use "air" as the value of `nodename`.
+
+Returns the number of nodes set.
+
+### worldedit.replace(pos1, pos2, searchnode, replacenode)
+
+Replaces all instances of `searchnode` with `replacenode` in a region defined by positions `pos1` and `pos2`.
+
+Returns the number of nodes replaced.
+
+### worldedit.copy(pos1, pos2, axis, amount)
+
+Copies the region defined by positions `pos1` and `pos2` along the `axis` axis ("x" or "y" or "z") by `amount` nodes.
+
+Returns the number of nodes copied.
+
+### worldedit.move(pos1, pos2, axis, amount)
+
+Moves the region defined by positions `pos1` and `pos2` along the `axis` axis ("x" or "y" or "z") by `amount` nodes.
+
+Returns the number of nodes moved.
+
+### worldedit.stack(pos1, pos2, axis, count)
+
+duplicates the region defined by positions `pos1` and `pos2` along the `axis` axis ("x" or "y" or "z") `count` times.
+
+Returns the number of nodes stacked.
+
+### worldedit.dig(pos1, pos2)
+
+Digs a region defined by positions `pos1` and `pos2`.
+
+Returns the number of nodes dug.
+
+### worldedit.serialize(pos1, pos2)
+
+Converts the region defined by positions `pos1` and `pos2` into a single string.
+
+Returns the serialized data and the number of nodes serialized.
+
+### worldedit.deserialize(originpos, value)
+
+Loads the nodes represented by string `value` at position `originpos`.
+
+Returns the number of nodes deserialized.
+
 License
 -------
 Copyright 2012 sfan5 and Anthony Zhang (Temperest)
diff --git a/functions.lua b/functions.lua
index 2226e4c..35015a5 100644
--- a/functions.lua
+++ b/functions.lua
@@ -20,8 +20,8 @@ worldedit.volume = function(pos1, pos2)
 	return (pos2.x - pos1.x + 1) * (pos2.y - pos1.y + 1) * (pos2.z - pos1.z + 1)
 end
 
---fills a region defined by positions `pos1` and `pos2` with `nodename`, returning the number of nodes filled
-worldedit.fill = function(pos1, pos2, nodename)
+--sets a region defined by positions `pos1` and `pos2` to `nodename`, returning the number of nodes filled
+worldedit.set = function(pos1, pos2, nodename)
 	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
 	local env = minetest.env
 
@@ -72,7 +72,7 @@ worldedit.replace = function(pos1, pos2, searchnode, replacenode)
 	return count
 end
 
---copies the region defined by positions `pos1` and `pos2` along the `axis` axis by `amount` nodes, returning the number of nodes copied
+--copies the region defined by positions `pos1` and `pos2` along the `axis` axis ("x" or "y" or "z") by `amount` nodes, returning the number of nodes copied
 worldedit.copy = function(pos1, pos2, axis, amount)
 	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
 	local env = minetest.env
@@ -117,7 +117,7 @@ worldedit.copy = function(pos1, pos2, axis, amount)
 	return worldedit.volume(pos1, pos2)
 end
 
---moves the region defined by positions `pos1` and `pos2` along the `axis` axis by `amount` nodes, returning the number of nodes moved
+--moves the region defined by positions `pos1` and `pos2` along the `axis` axis ("x" or "y" or "z") by `amount` nodes, returning the number of nodes moved
 worldedit.move = function(pos1, pos2, axis, amount)
 	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
 	local env = minetest.env
@@ -164,7 +164,7 @@ worldedit.move = function(pos1, pos2, axis, amount)
 	return worldedit.volume(pos1, pos2)
 end
 
---duplicates the region defined by positions `pos1` and `pos2` along the `axis` axis `count` times, returning the number of nodes stacked
+--duplicates the region defined by positions `pos1` and `pos2` along the `axis` axis ("x" or "y" or "z") `count` times, returning the number of nodes stacked
 worldedit.stack = function(pos1, pos2, axis, count)
 	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
 	local length = pos2[axis] - pos1[axis] + 1
diff --git a/init.lua b/init.lua
index f37f754..3191bd0 100644
--- a/init.lua
+++ b/init.lua
@@ -112,8 +112,8 @@ minetest.register_chatcommand("/set", {
 			return
 		end
 
-		local count = worldedit.fill(pos1, pos2, param)
-		minetest.chat_send_player(name, count .. " nodes filled")
+		local count = worldedit.set(pos1, pos2, param)
+		minetest.chat_send_player(name, count .. " nodes set")
 	end,
 })