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-rw-r--r--nixos/doc/manual/release-notes/rl-2405.section.md4
1 files changed, 4 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 05c06ebcac1b..e11524f0de8a 100644
--- a/nixos/doc/manual/release-notes/rl-2405.section.md
+++ b/nixos/doc/manual/release-notes/rl-2405.section.md
@@ -286,6 +286,10 @@ The pre-existing [services.ankisyncd](#opt-services.ankisyncd.enable) has been m
   [fileSystems.overlay](#opt-fileSystems._name_.overlay.lowerdir). See also the
   [NixOS docs](#sec-overlayfs).
 
+- systemd units can now specify the `Upholds=` and `UpheldBy=` unit dependencies via the aptly
+  named `upholds` and `upheldBy` options. These options get systemd to enforce that the
+  dependencies remain continuosly running for as long as the dependent unit is in a running state.
+
 - `stdenv`: The `--replace` flag in `substitute`, `substituteInPlace`, `substituteAll`, `substituteAllStream`, and `substituteStream` is now deprecated if favor of the new `--replace-fail`, `--replace-warn` and `--replace-quiet`. The deprecated `--replace` equates to `--replace-warn`.
 
 - A new hardening flag, `zerocallusedregs` was made available, corresponding to the gcc/clang option `-fzero-call-used-regs=used-gpr`.