Update Changelog.md

phil-opp · web-flow · commit 0a709e154534 · 2020-10-03T14:00:22.000+02:00
diff --git a/Changelog.md b/Changelog.md
@@ -6,7 +6,7 @@
 
 # 0.4.0 – 2020-09-21
 
-- Rewrite crate to operate on reference values ([#13](https://github.com/rust-osdev/volatile/pull/13))
+- **Breaking:** Rewrite crate to operate on reference values ([#13](https://github.com/rust-osdev/volatile/pull/13))
 
 # 0.3.0 – 2020-07-29
 
