diff --git a/README.md b/README.md
index 6d80738..c85d46f 100644
--- a/README.md
+++ b/README.md
@@ -169,6 +169,7 @@ pip install docopt
 You'll need to install *exiftool* *pyexiv2* using  `homebrew` on OSX. If you're running another operating system you're sort of on your own but my pal Google should be able to help. Some folks may be able to simply run these commands. Installing *boost* is a drag and can take up to 30 minutes. Don't say I didn't warn you.
 
 ```
+brew update
 brew install exiftool
 brew install boost --build-from-source
 brew install pyexiv2