diff --git a/nixos/modules/programs/man.nix b/nixos/modules/programs/man.nix
index e59ffd6f936d..5b20a38d8856 100644
--- a/nixos/modules/programs/man.nix
+++ b/nixos/modules/programs/man.nix
@@ -11,6 +11,7 @@ with lib;
       default = true;
       description = ''
         Whether to enable manual pages and the <command>man</command> command.
+        This also includes "man" outputs of all <literal>systemPackages</literal>.
       '';
     };