diff --git a/lib/cloud/aws_trails.rego b/lib/cloud/aws_trails.rego
index a25c87d4..50692766 100644
--- a/lib/cloud/aws_trails.rego
+++ b/lib/cloud/aws_trails.rego
@@ -1,3 +1,9 @@
+# METADATA
+# custom:
+#   library: true
+#   input:
+#     selector:
+#     - type: cloud
 package lib.aws.trails
 
 import rego.v1
diff --git a/lib/docker/docker.rego b/lib/docker/docker.rego
index f9d35811..06d62162 100644
--- a/lib/docker/docker.rego
+++ b/lib/docker/docker.rego
@@ -1,5 +1,6 @@
 # METADATA
 # custom:
+#   library: true
 #   input:
 #     selector:
 #     - type: dockerfile