diff --git a/README.md b/README.md
index 1ba90c004c..a05d8a1a71 100644
--- a/README.md
+++ b/README.md
@@ -154,6 +154,7 @@ make install
 `ZIG_LIBC_LIB_DIR` and `ZIG_LIBC_STATIC_LIB_DIR` are unused.
 
 ```
+brew install cmake
 brew install llvm@5
 brew outdated llvm@5 || brew upgrade llvm@5
 mkdir build