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-rw-r--r--nixos/doc/manual/release-notes/rl-2405.section.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/nixos/doc/manual/release-notes/rl-2405.section.md b/nixos/doc/manual/release-notes/rl-2405.section.md
index a3e69102b0f2a..a5e9efbc4e18a 100644
--- a/nixos/doc/manual/release-notes/rl-2405.section.md
+++ b/nixos/doc/manual/release-notes/rl-2405.section.md
@@ -27,6 +27,8 @@ The pre-existing [services.ankisyncd](#opt-services.ankisyncd.enable) has been m
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
 
+- The `power.ups` module now generates `upsd.conf`, `upsd.users` and `upsmon.conf` automatically from a set of new configuration options. This breaks compatibility with existing `power.ups` setups where these files were created manually. Back up these files before upgrading NixOS.
+
 - `mkosi` was updated to v19. Parts of the user interface have changed. Consult the
   [release notes](https://github.com/systemd/mkosi/releases/tag/v19) for a list of changes.