diff --git a/doc/book/reference-manual/configuration.md b/doc/book/reference-manual/configuration.md
index 3110aab7..2a8c5df5 100644
--- a/doc/book/reference-manual/configuration.md
+++ b/doc/book/reference-manual/configuration.md
@@ -276,7 +276,7 @@ Compression is done synchronously, setting a value too high will add latency to
 This value can be different between nodes, compression is done by the node which receive the
 API call.
 
-### `rpc_secret`, `rpc_secret_file` or `GARAGE_RPC_SECRET` (env)
+### `rpc_secret`, `rpc_secret_file` or `GARAGE_RPC_SECRET`, `GARAGE_RPC_SECRET_FILE` (env)
 
 Garage uses a secret key, called an RPC secret, that is shared between all
 nodes of the cluster in order to identify these nodes and allow them to
@@ -288,6 +288,9 @@ Since Garage `v0.8.2`, the RPC secret can also be stored in a file whose path is
 given in the configuration variable `rpc_secret_file`, or specified as an
 environment variable `GARAGE_RPC_SECRET`.
 
+Since Garage `v0.9.0`, you can also specify the path of a file storing the secret
+as the `GARAGE_RPC_SECRET_FILE` environment variable.
+
 ### `rpc_bind_addr`
 
 The address and port on which to bind for inter-cluster communcations
@@ -465,7 +468,7 @@ See [administration API reference](@/documentation/reference-manual/admin-api.md
 Alternatively, since `v0.8.5`, a path can be used to create a unix socket. Note that for security reasons,
 the socket will have 0220 mode. Make sure to set user and group permissions accordingly.
 
-### `metrics_token`, `metrics_token_file` or `GARAGE_METRICS_TOKEN` (env)
+### `metrics_token`, `metrics_token_file` or `GARAGE_METRICS_TOKEN`, `GARAGE_METRICS_TOKEN_FILE` (env)
 
 The token for accessing the Metrics endpoint. If this token is not set, the
 Metrics endpoint can be accessed without access control.
@@ -475,8 +478,9 @@ You can use any random string for this value. We recommend generating a random t
 `metrics_token` was introduced in Garage `v0.7.2`.
 `metrics_token_file` and the `GARAGE_METRICS_TOKEN` environment variable are supported since Garage `v0.8.2`.
 
+`GARAGE_METRICS_TOKEN_FILE` is supported since `v0.9.0`.
 
-### `admin_token`, `admin_token_file` or `GARAGE_ADMIN_TOKEN` (env)
+### `admin_token`, `admin_token_file` or `GARAGE_ADMIN_TOKEN`, `GARAGE_ADMIN_TOKEN_FILE` (env)
 
 The token for accessing all of the other administration endpoints.  If this
 token is not set, access to these endpoints is disabled entirely.
@@ -486,6 +490,7 @@ You can use any random string for this value. We recommend generating a random t
 `admin_token` was introduced in Garage `v0.7.2`.
 `admin_token_file` and the `GARAGE_ADMIN_TOKEN` environment variable are supported since Garage `v0.8.2`.
 
+`GARAGE_ADMIN_TOKEN_FILE` is supported since `v0.9.0`.
 
 ### `trace_sink`