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-rw-r--r--src/doc/rustc-dev-guide/README.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/doc/rustc-dev-guide/README.md b/src/doc/rustc-dev-guide/README.md
index 006ea3231..e501c9161 100644
--- a/src/doc/rustc-dev-guide/README.md
+++ b/src/doc/rustc-dev-guide/README.md
@@ -43,7 +43,7 @@ rustdocs][rustdocs].
To build a local static HTML site, install [`mdbook`](https://github.com/rust-lang/mdBook) with:
```
-> cargo install mdbook mdbook-linkcheck mdbook-toc
+> cargo install mdbook mdbook-linkcheck mdbook-toc mdbook-mermaid
```
and execute the following command in the root of the repository: