# IRPCVaultAdmin.EnableAnnotationsAndRedlining

Location: [gRPC API](https://developer.m-files.com/APIs/gRPC-API/index.md) > [Administration API](https://developer.m-files.com/APIs/gRPC-API/admin/index.md) > [Vault administration](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCVaultAdmin/index.md)

HTML version: https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCVaultAdmin/EnableAnnotationsAndRedlining/

Badges: `Administration API / specialized` `admin` `session` `idempotent`

Enables annotations and redlining in the vault by creating the metadata structure elements that
the feature needs.

- **Service:** [Vault administration](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCVaultAdmin/index.md) `MFiles.IRPCVaultAdmin`
- **gRPC method:** `/MFiles.IRPCVaultAdmin/EnableAnnotationsAndRedlining`
- **HTTP (mf-http-grpc):** `POST /grpc/v1/enable-annotations-and-redlining`
- **Request:** [`EnableAnnotationsAndRedliningRequest`](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCVaultAdmin/EnableAnnotationsAndRedlining/index.md#request)
- **Response:** [`EnableAnnotationsAndRedliningResponse`](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCVaultAdmin/EnableAnnotationsAndRedlining/index.md#response)
- **Book and level:** Administration API, specialized
- **Kind:** admin
- **Session:** Required: the session ID from LogIn in the mfiles-session-id-bin metadata.
- **Idempotent:** yes
- **Returns metadata structure version:** no
- **Streaming:** none (unary)

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## Remarks

- Requires a vault session and the vault rights `change_metadata_structure` and
  `license_allows_modifications`.
- Changes the metadata structure of the vault; creates only the elements that are missing, so
  calling it again does no harm.

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## Request: EnableAnnotationsAndRedliningRequest

No fields.

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## Response: EnableAnnotationsAndRedliningResponse

No fields.