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--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # blockdiff
 
-Fast block-level file diffs (e.g. for VM disk images) using CoW filesystem metadata
+Fast block-level file diffs (e.g. for VM disk images) using CoW filesystem metadata.
+
+[![Rust](https://img.shields.io/badge/rust-stable-orange.svg)](https://www.rust-lang.org/)
 
 ## Usage