diff --git a/taskcluster/docs/attributes.rst b/taskcluster/docs/attributes.rst
index e8773661a051..aa456a6927ea 100644
--- a/taskcluster/docs/attributes.rst
+++ b/taskcluster/docs/attributes.rst
@@ -526,3 +526,8 @@ Used by android browsertime tasks to track the abi of the product under test.
 apk
 ===
 Used by android browsertime tasks to track the path to the apk of the product under test.
+
+test-manifests
+==============
+
+A list of the test manifests that run in this task.