diff --git a/README-zng.md b/README-zng.md
index 3ab32da8..4ac40e08 100644
--- a/README-zng.md
+++ b/README-zng.md
@@ -32,6 +32,13 @@ manifest for `libz-ng-sys`. The script `./cargo-zng` invokes Cargo on a
 temporary copy of the sources with `Cargo-zng.toml` replacing `Cargo.toml`; for
 instance, use `./cargo-zng publish` to publish `libz-ng-sys`.
 
+# Minimum Supported Rust Version (MSRV) Policy
+
+This crate uses the same MSRV policy as the
+[`flate2`](https://crates.io/crates/flate2) crate: This crate supports the
+current and previous stable versions of Rust. Older versions of Rust may work,
+but we don't guarantee these will continue to work.
+
 # License
 
 This project is licensed under either of
diff --git a/README.md b/README.md
index fcd72bfc..26088b1f 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,13 @@ exclusively from Rust or support the zlib-ng native C API (prefixed with
 which allows zlib and zlib-ng to coexist in the same program. See
 [README-zng.md](README-zng.md) for details.
 
+# Minimum Supported Rust Version (MSRV) Policy
+
+This crate uses the same MSRV policy as the
+[`flate2`](https://crates.io/crates/flate2) crate: This crate supports the
+current and previous stable versions of Rust. Older versions of Rust may work,
+but we don't guarantee these will continue to work.
+
 # License
 
 This project is licensed under either of