diff --git a/metadata.yaml b/metadata.yaml
index c84f059..47220f4 100644
--- a/metadata.yaml
+++ b/metadata.yaml
@@ -11,6 +11,8 @@ description: |
   network encryption-as-a-service, or generate AWS IAM/STS
   credentials, SQL/NoSQL databases, X.509 certificates,
   SSH credentials, and more.
+series:
+  - xenial
 tags:
   - security
 requires: