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diff --git a/doc/book/reference-manual/configuration.md b/doc/book/reference-manual/configuration.md
index 3f6ec091..df1251c2 100644
--- a/doc/book/reference-manual/configuration.md
+++ b/doc/book/reference-manual/configuration.md
@@ -91,6 +91,19 @@ This folder can be placed on an HDD. The space available for `data_dir`
should be counted to determine a node's capacity
when [adding it to the cluster layout](@/documentation/cookbook/real-world.md).
+Since `v0.9.0`, Garage supports multiple data directories with the following syntax:
+
+```toml
+data_dir = [
+ { path = "/path/to/old_data", read_only = true },
+ { path = "/path/to/new_hdd1", capacity = "2T" },
+ { path = "/path/to/new_hdd2", capacity = "4T" },
+]
+```
+
+See [the dedicated documentation page](@/documentation/operations/multi-hdd.md)
+on how to operate Garage in such a setup.
+
### `db_engine` (since `v0.8.0`)
By default, Garage uses the Sled embedded database library