Clarify chromedriver instructions

README.md

@@ -28,7 +28,16 @@ requirements.txt`, then you can just run `python -m deletefb.deletefb.py` in the
 ## How To Use It
 
 * Make sure that you have Google Chrome installed and that it is up to date
-* Also install the chromedriver for Selenium. See [here](https://sites.google.com/a/chromium.org/chromedriver/downloads). On Arch Linux you can find this in the `chromium` package, and on Ubuntu it is `chromium-chromedriver`.
+* Also install the chromedriver for Selenium. See [here](https://sites.google.com/a/chromium.org/chromedriver/downloads).
+  * On Linux, it will be called something like `chromium-chromedriver` or just
+    `chromium`.
+  * On MacOS, it will be available via brew, with the following commands:
+
+    ```
+    brew tap homebrew/cask;
+    brew cask install chromedriver
+    ```
+
 * Run `deletefb -E "youremail@example.org" -P "yourfacebookpassword" -U "https://www.facebook.com/your.profile.url"`
 * The script will log into your Facebook account, go to your profile page, and
   start deleting posts. If it cannot delete something, then it will "hide" it