Mention that an A.js snippet must be added to each subdomain (#4067)

ashton-huxtable · markzegarelli · web-flow · commit b4654084aea1 · 2023-01-19T08:53:24.000-08:00
* Update index.md

* Update src/connections/sources/catalog/libraries/website/javascript/index.md

Co-authored-by: markzegarelli &lt;mark.zegarelli@segment.com&gt;
diff --git a/src/connections/sources/catalog/libraries/website/javascript/index.md b/src/connections/sources/catalog/libraries/website/javascript/index.md
@@ -758,6 +758,7 @@ Segment offers video player 'plugins' so you can quickly collect video events us
 
 Analytics.js tracks across subdomains out of the box; all Segment destinations fully support this feature.
 
+To track activity on your subdomains, include the Segment Analytics.js snippet on each subdomain. Segment sets users' `anonymousId` on the top-level domain, so users are tracked across any subdomains.
 
 ## Analytics.js performance
 

Original file line number	Diff line number	Diff line change
`@@ -758,6 +758,7 @@ Segment offers video player 'plugins' so you can quickly collect video events us`
`758`	`758`
`759`	`759`	`Analytics.js tracks across subdomains out of the box; all Segment destinations fully support this feature.`
`760`	`760`
	`761`	+To track activity on your subdomains, include the Segment Analytics.js snippet on each subdomain. Segment sets users' `anonymousId` on the top-level domain, so users are tracked across any subdomains.
`761`	`762`
`762`	`763`	`## Analytics.js performance`
`763`	`764`