service/vault.md

@@ -360,6 +360,15 @@ label ~Foo.
 
 ## Upstream
 
+The server is setup with [vaultwarden](https://github.com/dani-garcia/vaultwarden), an "Unofficial Bitwarden
+compatible server written in Rust, formerly known as
+`bitwarden_rs`". It's active as of December 2025, with regular commits
+and releases.
+
+According to the vaultwarden README, "one of the active maintainers
+for Vaultwarden is employed by Bitwarden and is allowed to contribute
+to the project on their own time".
+
 <!-- who the upstreams are, if they are still active, -->
 <!-- collaborative, how do we keep up to date, support channels, see -->
 <!-- also the "Issues" section above -->
@@ -388,6 +397,9 @@ The logs for Vaultwarden can be read using
 
 <!-- references to upstream documentation, if relevant -->
 
+Vaultwarden has its own [wiki](https://github.com/dani-garcia/vaultwarden/wiki) but essentially links to the
+[official Bitwarden help pages](https://bitwarden.com/help/) for most features.
+
 # Discussion
 
 <!-- the "discussion" section is where you put any longer conversation -->