From 7a7507d62795efaf5aa7cd9ac3b44b7b29bf27cd Mon Sep 17 00:00:00 2001
From: Bradley Wright <bradley.wright@digital.cabinet-office.gov.uk>
Date: Fri, 1 May 2015 11:31:11 +0100
Subject: [PATCH] Add documentation for addLinkedTrackerDomain method

---
 docs/analytics.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/docs/analytics.md b/docs/analytics.md
index e8d6e075..404e3e6c 100644
--- a/docs/analytics.md
+++ b/docs/analytics.md
@@ -160,3 +160,15 @@ Pull `print-intent.js` into your project, and initialise it after analytics (see
 ## Error tracking
 
 Pull `error-tracking.js` into your project, and initialise it after analytics (see [Create an analytics tracker, above](#create-an-analytics-tracker)), to track JavaScript errors.
+
+## Tracking across domains
+
+Once a Tracker instance has been created, tracking across domains can be set up
+for pages like:
+
+```js
+GOVUK.analytics.addLinkedTrackerDomain(trackerIdHere, nameForTracker, domainToLinkTo);
+```
+
+Once this is done hits to that page will be tracked in both your local and the
+named tracker, and sessions will persist to the other domain.