diff --git a/nixos/modules/services/misc/nix-daemon.nix b/nixos/modules/services/misc/nix-daemon.nix
index b79a69e2ba8..b5a8a7df9fc 100644
--- a/nixos/modules/services/misc/nix-daemon.nix
+++ b/nixos/modules/services/misc/nix-daemon.nix
@@ -143,7 +143,7 @@ in
         default = 0;
         description = ''
           Nix daemon process priority. This priority propagates to build processes.
-          0 is the default Unix process priority, 20 is the lowest.
+          0 is the default Unix process priority, 19 is the lowest.
         '';
       };