From dfcf02bbc204a7c7066234ed0d447c3faf036fc9 Mon Sep 17 00:00:00 2001
From: Anthony Zhang <azhang9@gmail.com>
Date: Mon, 22 Jul 2013 11:04:03 -0400
Subject: [PATCH] Add a few notes on air.

---
 Chat Commands.md | 5 +++--
 README.md        | 2 ++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/Chat Commands.md b/Chat Commands.md
index 08adbaf..e44f242 100644
--- a/Chat Commands.md	
+++ b/Chat Commands.md	
@@ -66,6 +66,7 @@ Display the volume of the current WorldEdit region.
 
 Set the current WorldEdit region to <node>.
 
+    //set air
     //set cactus
     //set Bronze Block
     //set mesecons:wire_00000000_off
@@ -74,7 +75,7 @@ Set the current WorldEdit region to <node>.
 
 Replace all instances of <search node> with <replace node> in the current WorldEdit region.
 
-    //replace Cobblestone cactus
+    //replace Cobblestone air
     //replace lightstone_blue glass
     //replace dirt Bronze Block
     //replace mesecons:wire_00000000_off flowers:flower_tulip
@@ -83,7 +84,7 @@ Replace all instances of <search node> with <replace node> in the current WorldE
 
 Replace all nodes other than <search node> with <replace node> in the current WorldEdit region.
 
-    //replaceinverse Cobblestone cactus
+    //replaceinverse Cobblestone air
     //replaceinverse flowers:flower_waterlily glass
     //replaceinverse dirt Bronze Block
     //replaceinverse mesecons:wire_00000000_off flowers:flower_tulip
diff --git a/README.md b/README.md
index 764806e..ee1646c 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,8 @@ Second, by name - the node name that is defined by code, but without the mod nam
 
 Finally, by full name - the unambiguous identifier of the node, prefixes and all. This is case sensitive and includes values such as "default:stone" and "mesecons:wire_00000000_off".
 
+The node name "air" can be used anywhere a normal node name can, and acts as a blank node. This is useful for clearing or removing nodes. For example, `//set air` would remove all the nodes in the current WorldEdit region. Similarly, `//sphere 10 air`, when WorldEdit position 1 underground, would dig a large sphere out of the ground.
+
 Regions
 -------
 Most WorldEdit commands operate on regions. Regions are a set of two positions that define a 3D cube. They are local to each player and chat commands affect only the region for the player giving the commands.