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diff --git a/README.md b/README.md
index 5aad4d4..a8cb3eb 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,8 @@ git clone https://github.com/rust-lang/rustlings.git
 cd rustlings
 ```
 
+_Note: If you're on MacOS, make sure you've installed Xcode and its developer tools by typing `xcode-select --install`._
+
 Once in the directory you can install `rustlings` on your machine and run the introduction:
 
 ```bash