diff --git a/README.md b/README.md
index 7f7aa7cfd..06db18cac 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,10 @@ Almost all of the implementation was shamelessly adapted from the
 Cargo.toml:
 
 ```toml
+[package]
+# ...
+resolver = "2"
+
 [dependencies]
 cortex-m = "0.7.2"
 cortex-m-rt = { version = "0.6.13", features = ["device"] }