diff --git a/nixos/modules/system/boot/systemd.nix b/nixos/modules/system/boot/systemd.nix
index a3bff27626d8..8f2044a0985e 100644
--- a/nixos/modules/system/boot/systemd.nix
+++ b/nixos/modules/system/boot/systemd.nix
@@ -325,8 +325,8 @@ in
       type = types.lines;
       example = "DefaultLimitCORE=infinity";
       description = lib.mdDoc ''
-        Extra config options for systemd. See man systemd-system.conf for
-        available options.
+        Extra config options for systemd. See systemd-system.conf(5) man page
+        for available options.
       '';
     };