diff --git a/macOS.md b/macOS.md
index 0ab9af5..d5cc208 100644
--- a/macOS.md
+++ b/macOS.md
@@ -8,4 +8,4 @@ You might find an error when executing gcc:
 xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
 ````
 
-In this case, run `xcode-select --install`.
+In this case, run `xcode-select --install` and select commandline tools.