diff --git a/README.md b/README.md
index 3d1e6e1e8b..d4b7b39f69 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,9 @@ Add `iced` as a dependency in your `Cargo.toml`:
 iced = "0.4"
 ```
 
+If your project is using a Rust edition older than 2021, then you will need to
+set `resolver = "2"` in the `[package]` section as well.
+
 __Iced moves fast and the `master` branch can contain breaking changes!__ If
 you want to learn about a specific release, check out [the release list].