diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5cd860d..b8dd640 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ Note to self: See the bottom of this file for the release template text.
 
 
 ### Bugfixes
- - `//airapply`: Improve error handling
+ - `//airapply`: Improve error handling, fix safe_region node counter
  - `//floodfill`: Fix crash caused by internal refactoring of the `Queue` data structure
  - `//spop`: Fix wording in displayed message
 
diff --git a/README.md b/README.md
index 4735090..fcfc505 100644
--- a/README.md
+++ b/README.md
@@ -71,10 +71,10 @@ The detailed explanations have moved! Check them out [here](https://github.com/s
  - [`//spop`](https://worldeditadditions.mooncarrot.space/Reference/#spop)
  
 ### Measure
- - [`//mface`](https://worldeditadditions.mooncarrot.space/Reference/#mface)
- - [`//midpos`](https://worldeditadditions.mooncarrot.space/Reference/#midpos)
- - [`//msize`](https://worldeditadditions.mooncarrot.space/Reference/#msize)
- - [`//mtrig`](https://worldeditadditions.mooncarrot.space/Reference/#mtrig)
+ - [`//mface`](https://worldeditadditions.mooncarrot.space/Reference/#mface) _(new in v1.13)_
+ - [`//midpos`](https://worldeditadditions.mooncarrot.space/Reference/#midpos) _(new in v1.13)_
+ - [`//msize`](https://worldeditadditions.mooncarrot.space/Reference/#msize) _(new in v1.13)_
+ - [`//mtrig`](https://worldeditadditions.mooncarrot.space/Reference/#mtrig) _(new in v1.13)_
  
 ### Meta
  - [`//multi <command_a> <command_b> ....`](https://worldeditadditions.mooncarrot.space/Reference/#multi)
@@ -82,6 +82,7 @@ The detailed explanations have moved! Check them out [here](https://github.com/s
  - [`//subdivide <size_x> <size_y> <size_z> <cmd_name> <args>`](https://worldeditadditions.mooncarrot.space/Reference/#subdivide)
  - [`//ellipsoidapply <command_name> <args>`](https://worldeditadditions.mooncarrot.space/Reference/#ellipsoidapply) _(new in v1.9)_
  - [`//airapply <command_name> <args>`](https://worldeditadditions.mooncarrot.space/Reference/#airapply) _(new in v1.9)_
+ - [`//noiseapply2d <command_name> <args>`](https://worldeditadditions.mooncarrot.space/Reference/#noiseapply2d) _(new in v1.13)_
 
 ### Extras
  - [`//y`](https://github.com/sbrl/Minetest-WorldEditAdditions/blob/main/Chat-Command-Reference.md#y)
diff --git a/worldeditadditions_commands/commands/meta/airapply.lua b/worldeditadditions_commands/commands/meta/airapply.lua
index c5e04df..d9478a5 100644
--- a/worldeditadditions_commands/commands/meta/airapply.lua
+++ b/worldeditadditions_commands/commands/meta/airapply.lua
@@ -38,8 +38,10 @@ worldedit.register_command("airapply", {
 		return true, cmd_we, args_parsed
 	end,
 	nodes_needed = function(name)
-		local pos1, pos2 = worldedit.sort_pos(worldedit.pos1[name], worldedit.pos2[name])
-		return math.ceil(4/3 * math.pi * (pos2.x - pos1.x)/2 * (pos2.y - pos1.y)/2 * (pos2.z - pos1.z)/2)
+		return worldedit.volume(
+			worldedit.pos1[name],
+			worldedit.pos2[name]
+		)
 	end,
 	func = function(name, cmd, args_parsed)
 		if not minetest.check_player_privs(name, cmd.privs) then