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-rw-r--r--nixos/modules/services/backup/zrepl.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/nixos/modules/services/backup/zrepl.nix b/nixos/modules/services/backup/zrepl.nix
index 4356479b6635e..73f5e4d9f6d76 100644
--- a/nixos/modules/services/backup/zrepl.nix
+++ b/nixos/modules/services/backup/zrepl.nix
@@ -38,6 +38,9 @@ in
     environment.etc."zrepl/zrepl.yml".source = configFile;
 
     systemd.packages = [ pkgs.zrepl ];
+
+    # Note that pkgs.zrepl copies and adapts the upstream systemd unit, and
+    # the fields defined here only override certain fields from that unit.
     systemd.services.zrepl = {
       requires = [ "local-fs.target" ];
       wantedBy = [ "zfs.target" ];