diff --git a/scripts/README.md b/scripts/README.md
index 45466c2e8dc..8376c6a1765 100644
--- a/scripts/README.md
+++ b/scripts/README.md
@@ -86,11 +86,15 @@ To remove the linked version of `ionic-angular` do `npm rm ionic-angular`, and t
 
 ### Running Snapshot
 
-#### Setup
+Snapshot compares to a base snapshot made on Mac OS with retina screen (2560x1600).
+It does not work for windows, linux, or non retina macs.
 
-1. Install [Protractor](https://angular.github.io/protractor/#/): `npm install -g protractor@2.5.1`
-2. Run `webdriver-manager update`
-3. Export `IONIC_SNAPSHOT_KEY` (get from someone)
+#### Setup (Mac OS X Only)
+
+1. Install Java JDK: `brew cask install java`
+2. Install [Protractor](https://angular.github.io/protractor/#/): `npm install -g protractor@2.5.1`
+3. Run `webdriver-manager update`
+4. Export `IONIC_SNAPSHOT_KEY` (get from someone)
 
 #### Commands