Adding ability to provide default for ec2region function

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/README.md b/README.md
index 9f51552b..a4f7718c 100644
--- a/README.md
+++ b/README.md
@@ -245,14 +245,23 @@ us-east-1
 
 #### `ec2region`
 
-Queries AWS to get the region. Returns `unknown` if it can't be determined for some reason.
+Queries AWS to get the region. An optional default can be provided, or returns
+`unknown` if it can't be determined for some reason.
 
 ##### Example
 
+_In EC2_
 ```console
 $ echo '{{ ec2region }}' | ./gomplate
 us-east-1
 ```
+_Not in EC2_
+```console
+$ echo '{{ ec2region }}' | ./gomplate
+unknown
+$ echo '{{ ec2region "foo" }}' | ./gomplate
+foo
+```
 
 #### `ec2tag`