diff --git a/README.md b/README.md
index bbf26ff6f71e..cf18e6a0670b 100644
--- a/README.md
+++ b/README.md
@@ -51,10 +51,10 @@ program, and cannot run all programs:
 
 ## Using Miri
 
-Install Miri via `rustup`:
+Install Miri on Rust nightly via `rustup`:
 
 ```sh
-rustup component add miri
+rustup +nightly component add miri
 ```
 
 If `rustup` says the `miri` component is unavailable, that's because not all