anchor.diff:        type = types.bool;
         default = true;
         description = ''
  -        If true, you are free to add new users and groups to the system
  +        If set to <literal>true</literal>, you are free to add new users and groups to the system
           with the ordinary <literal>useradd</literal> and
           <literal>groupadd</literal> commands. On system activation, the
           existing contents of the <literal>/etc/passwd</literal> and
           <literal>/etc/group</literal> files will be merged with the
           contents generated from the <literal>users.extraUsers</literal> and
  -        <literal>users.extraGroups</literal> options. If
  -        <literal>mutableUsers</literal> is false, the contents of the user and
  -        group files will simply be replaced on system activation. This also
  -        holds for the user passwords; if this option is false, all changed
  -        passwords will be reset according to the
  -        <literal>users.extraUsers</literal> configuration on activation. If
  -        this option is true, the initial password for a user will be set
  +        <literal>users.extraGroups</literal> options.
  +        The initial password for a user will be set
           according to <literal>users.extraUsers</literal>, but existing passwords
           will not be changed.
  +
  +        <warning>
  +        If set to <literal>false</literal>, the contents of the user and
  +        group files will simply be replaced on system activation. This also
  +        holds for the user passwords; all changed
  +        passwords will be reset according to the
  +        <literal>users.extraUsers</literal> configuration on activation.
  +        </warning>
         '';
       };
   
  
positive.code:         description = ''
            Specifies the hashed password for the user.
            ${passwordDescription}
          '';
        };
  
  
negative.code:     options.
    '';
  
    hashedPasswordDescription = ''
      To generate hashed password install <literal>mkpassword</literal>
      package and run <literal>mkpasswd -m sha-512</literal>.
    '';
  
    userOpts = { name, config, ... }: {
  
      options = {
  