diff --git a/README.md b/README.md
index 4ffdbc6..898d1d6 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,9 @@ periodically.
 This tool requires `cargo` to be installed. See https://www.rust-lang.org/tools/install
 for instructions on how to do this.
 
+This project follows the deprecation policy of [Synapse](https://matrix-org.github.io/synapse/latest/deprecation_policy.html)
+on Rust and will assume a recent stable version of Rust and the ability to fetch a more recent one if necessary.
+
 To build `synapse_auto_compressor`, clone this repository and navigate to the
 `synapse_auto_compressor/` subdirectory. Then execute `cargo build`.