[Tagging] How to tag beginning of a river

[Stephan Knauss]

On 25.02.2017 04:28, Dave Swarthout wrote:
> I'm wondering if it's possible to tag in some meaningful way, the place,
> usually a node, where a river begins. It seems this would be of interest
> to people besides myself but I don't think there is currently a way to
> tag such a place.

This mentions to optionally add a role "spring" for the "spring" node.

https://wiki.openstreetmap.org/wiki/Relation:waterway

Is this usable?

Stephan