anchor.diff:      init = mkOption {
         type = types.lines;
         default = "";
  -      description = "...";
  +      description = ''
  +        An init script that runs after the environment has been rebuilt or
  +        booted. Anything done here should be idempotent and inexpensive.
  +      '';
       };
   
       zsh = {
         rc = mkOption {
           type = types.lines;
           default = "";
  -        description = "...";
  +        description = ''
  +          Zsh lines to be written to $XDG_CONFIG_HOME/zsh/extra.zshrc and
  +          sourced by $XDG_CONFIG_HOME/zsh/.zshrc
  +        '';
         };
         env = mkOption {
           type = types.lines;
           default = "";
  -        description = "...";
  +        description = ''
  +          Zsh lines to be written to $XDG_CONFIG_HOME/zsh/extra.zshenv and
  +          sourced by $XDG_CONFIG_HOME/zsh/.zshenv
  +        '';
         };
       };
     };
  
positive.code:     alias = mkOption {
        type = with types; nullOr (attrsOf (nullOr (either str path)));
        default = {};
        description = "...";
      };
  
      packages = mkOption {
  
negative.code:     home = mkOption {
        type = options.home-manager.users.type.functor.wrapped;
        default = {};
        description = "A convenience alias for home-manager.users.{my.username}."
      };
  
      user = mkOption {
        type = types.submodule;
        default = {};
        description = "A convenience alias for users.users.{my.username}.";
      };
  
      env = mkOption {
        type = with types; attrsOf (either (either str path) (listOf (either str path)));
        default = {};
        description = ''
          An map of environment variables that are set later than
          environment.variables or environment.sessionVariables. This is insurance
          that XDG variables (and other essentials) are initialized by the time
          these are set.
        '';
        apply = mapAttrs
          (n: v: if isList v
                 then concatMapStringsSep ":" (x: toString x) v
  