diff --git a/README.md b/README.md
index 439ca6a..ede6216 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ sudo curl -o /usr/share/man/man1/tt.1.gz -L https://github.com/lemnos/tt/release
 ## OSX
 
 ```
-mkdir -p /usr/local/bin /usr/local/share/man/man1 # Usually created by brew
+sudo mkdir -p /usr/local/bin /usr/local/share/man/man1 # Usually created by brew
 
 sudo curl -L https://github.com/lemnos/tt/releases/download/v0.4.2/tt-osx -o /usr/local/bin/tt && sudo chmod +x /usr/local/bin/tt
 sudo curl -o /usr/local/share/man/man1/tt.1.gz -L https://github.com/lemnos/tt/releases/download/v0.4.2/tt.1.gz