diff --git a/nixos/doc/manual/release-notes/rl-2105.xml b/nixos/doc/manual/release-notes/rl-2105.xml
index 12a9ae2f44ea..489d74e1aef1 100644
--- a/nixos/doc/manual/release-notes/rl-2105.xml
+++ b/nixos/doc/manual/release-notes/rl-2105.xml
@@ -804,6 +804,16 @@ environment.systemPackages = [
      the deprecated <option>services.radicale.config</option> is used.
     </para>
    </listitem>
+   <listitem>
+    <para>
+     In the <option>security.acme</option> module, use of <literal>--reuse-key</literal>
+     parameter  for Lego has been removed. It was introduced for HKPK, but this security
+     feature is now deprecated. It is a better security practice to rotate key pairs
+     instead of always keeping the same. If you need to keep this parameter, you can add
+     it back using <literal>extraLegoRenewFlags</literal> as an option for the
+     appropriate certificate.
+    </para>
+   </listitem>
   </itemizedlist>
  </section>
 
diff --git a/nixos/modules/security/acme.nix b/nixos/modules/security/acme.nix
index eb3599b924d7..c0250171109f 100644
--- a/nixos/modules/security/acme.nix
+++ b/nixos/modules/security/acme.nix
@@ -152,7 +152,7 @@ let
     );
     renewOpts = escapeShellArgs (
       commonOpts
-      ++ [ "renew" "--reuse-key" ]
+      ++ [ "renew" ]
       ++ optionals data.ocspMustStaple [ "--must-staple" ]
       ++ data.extraLegoRenewFlags
     );