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-rw-r--r--doc/book/reference-manual/features.md8
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diff --git a/doc/book/reference-manual/features.md b/doc/book/reference-manual/features.md
index e8ba9510..433efd44 100644
--- a/doc/book/reference-manual/features.md
+++ b/doc/book/reference-manual/features.md
@@ -55,6 +55,14 @@ and with various levels of consistency, in order to adapt to a variety of usage
Read our reference page on [supported replication modes](@/documentation/reference-manual/configuration.md#replication_mode)
to select the replication mode best suited to your use case (hint: in most cases, `replication_mode = "3"` is what you want).
+### Compression and deduplication
+
+All data stored in Garage is deduplicated, and optionnally compressed using
+Zstd. Objects uploaded to Garage are chunked in blocks of constant sizes (see
+[`block_size`](@/documentation/reference-manual/configuration.md#block_size)),
+and the hashes of individual blocks are used to dispatch them to storage nodes
+and to deduplicate them.
+
### Web server for static websites
A storage bucket can easily be configured to be served directly by Garage as a static web site.