diff --git a/book/src/requirements.md b/book/src/requirements.md
index d13e3a85c2..cf719a0d61 100644
--- a/book/src/requirements.md
+++ b/book/src/requirements.md
@@ -75,13 +75,13 @@ Add `export LIBCLANG_PATH=/usr/local/lib` to your profile.
 
 #### From source
 
-If your package manager doesn't yet offer Clang 5.0, you'll need to build from
+If your package manager doesn't yet offer Clang 9.0, you'll need to build from
 source. For that, follow the
 instructions [here](http://clang.llvm.org/get_started.html).
 
 Those instructions list optional steps. For `bindgen`:
 
 * Checkout and build clang
-* Checkout and build the extra-clang-tools
+* Checkout and build `clang-tools-extra`
 * You do not need to checkout or build compiler-rt
 * You do not need to checkout or build libcxx