The current language says:

Enhanced Notifications
View and organize notifications more easily. Includes cross-wiki notifications, which lets you see messages from other wikis.

Here's what I propose for an addition:

Enhanced Notifications
View and organize notifications more easily. Includes cross-wiki notifications, which lets you see messages from other wikis. (To receive cross-wiki notifications on a given wiki, you must activate the beta feature on that wiki. No action is necessary to enable wikis to send notifications to other wikis.)

Comments from anyone? If not, I'll move this to RFP.

Some clarification seems useful here. However, I'm not sure all users view this through a send-receive mental model. That is, when I'm in English Wikipedia, cross-wikinotifications allow me to see the notifications that are at Commons (Commons is not sending those to English Wikipedia).

Under that perspective, while the first clarification ("To receive cross-wiki notifications on a given wiki, you must activate the beta feature on that wiki.") looks good, I found the second one confusing ("No action is necessary to enable wikis to send notifications to other wikis.").

I think that having the first clarification should be enough, especially since T117669: Invite users to enable Cross-wiki Notifications beta feature will help to explain why notifications are not shown (and how to enable them).

In T134014#2256186, @Pginer-WMF wrote:

Under that perspective, while the first clarification ("To receive cross-wiki notifications on a given wiki, you must activate the beta feature on that wiki.") looks good, I found the second one confusing ("No action is necessary to enable wikis to send notifications to other wikis.").

I agree with Pau and I would suggest to remove the second sentence.

I agree with Pau and I would suggest to remove the second sentence.

Sounds good. I went back and forth on that myself. So, the approved language to add to the preferences page will be:

Enhanced Notifications
View and organize notifications more easily. Includes cross-wiki notifications, which lets you see messages from other wikis. (To receive cross-wiki notifications on a given wiki, you must activate the beta feature on that wiki.)

I'll move this task to RFP.

Change 286538 had a related patch set uploaded (by Catrope):
Clarify beta feature description

https://gerrit.wikimedia.org/r/286538

Change 286538 merged by jenkins-bot:
Clarify beta feature description

https://gerrit.wikimedia.org/r/286538

Checked in betalabs.