- <literal>gnome</literal>, or
- <literal>kde</literal>.</para></listitem>
+ <literal>GNOME</literal>, or
+ <literal>KDE</literal>. It is
+ recommended to use the same
+ identifiers and capitalization as for
+ <varname>$XDG_CURRENT_DESKTOP</varname>,
+ as defined by the <ulink
+ url="http://standards.freedesktop.org/desktop-entry-spec/latest/">Desktop
+ Entry Specification</ulink>. (However,
+ note that
+ <varname>$XDG_SESSION_DESKTOP</varname>
+ only takes a single item, and not a
+ colon-separated list like
+ <varname>$XDG_CURRENT_DESKTOP</varname>.)
+ See
+ <citerefentry><refentrytitle>sd_session_get_desktop</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for more details.</para></listitem>