diff --git a/pipelines/set-pipelines.yml b/pipelines/set-pipelines.yml
index 458e9b2..ed76577 100644
--- a/pipelines/set-pipelines.yml
+++ b/pipelines/set-pipelines.yml
@@ -35,6 +35,8 @@ jobs:
           hello: HAL
       - set_pipeline: instance-groups
         file: concourse-examples/pipelines/pipeline-vars.yml
+        # instance_vars is currently experimental and requires the feature flag
+        # --enable-pipeline-instances
         instance_vars:
           first: initial
           number: "9000"