Document miri can only be installed on nightly

This updates the installation instructions to point out that miri is only available on nightly, and encodes this assumption into the installation instructions.
rust-lang · Jan 18, 2020 · 0acc309 · 0acc309
1 parent 6a0f14b
commit 0acc309
Showing 1 changed file with 2 additions and 2 deletions.
diff --git 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