diff --git a/operating_system/MacOS.md b/operating_system/MacOS.md
index 36ecb06..7f52bcd 100644
--- a/operating_system/MacOS.md
+++ b/operating_system/MacOS.md
@@ -6,6 +6,9 @@ You are here because you invested in an (expensive) awesome computer. Let's get
 xcode-select --install
 ```
 
+### Warning
+**Do not pip install!**. 
+Unless you really need to, but then be aware that conflicts may arise.
 ## Sublime Text 3
 
 [Download](http://www.sublimetext.com/3) and install it. Package Control / Config is now automatic at step "Dotfiles" below.