diff --git a/aws/documentation/gov-funding-lapse/README.md b/aws/documentation/gov-funding-lapse/README.md
index 9cc7c278..e86019d7 100644
--- a/aws/documentation/gov-funding-lapse/README.md
+++ b/aws/documentation/gov-funding-lapse/README.md
@@ -47,7 +47,7 @@ We will use a prefix of `gfl_` (government funding lapse).  Several tags will be
 
 * gfl_shutdown_timestamp
 
-This is **required**, and is the RFC 3389 or ISO 8601 timestamp of the time the service was shutdown.  You can get this from Linux with `date --iso=seconds`
+This is **required**, and is the RFC 3339 or ISO 8601 timestamp of the time the service was shutdown.  You can get this from Linux with `date --iso=seconds`
 or with Terraform in the `timestamp()` function or the `time` provider `rfc3389` attribute. With python:
 
 ```python