diff --git a/.gitignore b/.gitignore
index 5236e1e..70bb2a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 *~
+*.swp
 
diff --git a/api.lua b/api.lua
index 730e96d..c379b3d 100644
--- a/api.lua
+++ b/api.lua
@@ -29,9 +29,9 @@ function areas:getAreasAtPos(pos)
 		for id, area in pairs(self.areas) do
 			local ap1, ap2 = area.pos1, area.pos2
 			if
-					(px >= ap1.x and px <= ap2.x) and
-					(py >= ap1.y and py <= ap2.y) and
-					(pz >= ap1.z and pz <= ap2.z) then
+				(px >= ap1.x and px <= ap2.x) and
+				(py >= ap1.y and py <= ap2.y) and
+				(pz >= ap1.z and pz <= ap2.z) then
 				res[id] = area
 			end
 		end
diff --git a/api.md b/api.md
index c74b4c7..d0e08eb 100644
--- a/api.md
+++ b/api.md
@@ -1,3 +1,50 @@
+# API Extension
+
+Adding your protections to the HUD
+----------------------------------
+
+If you are providing an extra protection mod to work in conjunction with the
+HUD feature of `areas`, you can register a callback to add your mod's code to
+display your protection's existence.
+
+Registering a handler:
+
+* `areas.registerHudHandler(handler) --> nil`
+
+Handler specification:
+
+* `handler(pos,area_list) --> new_area_list`
+	* `pos` - the position at which to check for protection coverage by your mod
+	* `area_list` - the current list of protected areas
+	* `new_area_list` - the list of protected areas, updated with your entries
+
+Area list items:
+
+The area list item is a map table identified with an ID, and properties
+
+The ID should be in the format `modname:` and appended with an identifier for the protection.
+
+Each area list item should be a table with the following properties
+
+* `owner` - (required) the name of the protection owner
+* `name` - (optional) the name of the area
+
+Example
+-------
+
+	local myhandler = function(pos,area_list)
+		local areaowner = find_my_protections(pos)
+
+		if areaowner then
+			arealist["mymodname:first"] = {
+				name = "Protection name",
+				owner = areaowner, 
+			}
+		end
+	end
+
+	areas.register_hud_handler(myhandler)
+=======
 Areas mod API
 ===