diff --git a/cluster/aws/options.md b/cluster/aws/options.md
index 421798728bb..ed2e78b7a3f 100644
--- a/cluster/aws/options.md
+++ b/cluster/aws/options.md
@@ -7,7 +7,7 @@ This is a work-in-progress; not all options are documented yet!
 
 ## ZONE
 
-The AWS availability to deploy to.  Defaults to us-west-2a.
+The AWS availability zone to deploy to.  Defaults to us-west-2a.
 
 ## AWS_IMAGE