notes: warn that var_sources is experimental
#### <sub><sup><a name="4600" href="#4600">:link:</a></sup></sub> feature
-* @evanchaoli added support for [`var_sources`](https://concourse-ci.org/runtime-vars.html#var-sources) in the pipeline config. With this feature, concourse can fetch secrets from multiple independent credential managers per pipeline. This enables workflows where teams sharing a Concouse instance can independently manage their own credential managers. #4600, #4777
+* @evanchaoli added support for [`var_sources`](https://concourse-ci.org/runtime-vars.html#var-sources) in the pipeline config. With this feature, concourse can fetch secrets from multiple independent credential managers per pipeline. While this feature is currently in an **experimental** state and not yet tested in production, it is the first step to enabling workflows where teams sharing a Concourse instance can independently manage their own credential managers. For the moment, only vault or the dummy credential manager can be used to back a `var_source` (the other credential manager types do not work). #4600, #4777
#### <sub><sup><a name="4657" href="#4657">:link:</a></sup></sub> feature
