diff --git a/misc/systemd/nix-daemon.service.in b/misc/systemd/nix-daemon.service.in
index 25655204d..b4badf2ba 100644
--- a/misc/systemd/nix-daemon.service.in
+++ b/misc/systemd/nix-daemon.service.in
@@ -1,5 +1,6 @@
 [Unit]
 Description=Nix Daemon
+Documentation=man:nix-daemon https://nixos.org/manual
 RequiresMountsFor=@storedir@
 RequiresMountsFor=@localstatedir@
 ConditionPathIsReadWrite=@localstatedir@/nix/daemon-socket