Hi I18n team, Docs team changed convention about RST markup for options[1]. The newer version of Sphinx warns about :option:` ` usage without .. option:: description. Since we do not use .. option:: to describe parameter, remove :option:` `. Please keep in mind using :option:` ` breaks build in traslating. [1] http://docs.openstack.org/contributor-guide/rst-conv/inline-markups.html#opt... Regards, KATO Tomoyuki