Fix README.md

contain-rs · Feb 13, 2023 · 91ba7ff · 91ba7ff
1 parent 3a30267
commit 91ba7ff
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/README.md b/README.md
@@ -40,8 +40,11 @@ Add this to your Cargo.toml:
 bit-vec = "0.6"
 ```
 
-and this to your crate root:
+Since Rust 2018, `extern crate` is no longer mandatory. If your edition is old (Rust 2015),
+add this to your crate root:
 
+```rust
+extern crate bit_vec;
 ```
 
 If you want [serde](https://github.com/serde-rs/serde) support, include the feature like this: