A haiku must include a ''kigo'' which indicates which season the haiku is set in.<ref>[http://renku.home.att.net/500ESWd.html 500 Seasonal words]</ref><ref>[http://www.youngleaves.org/poetry/The%20Yuki%20Teikei%20Haiku%20Season%20Word%20List.htm Seasonal words from the 1977-78 Haiku Journal]</ref> | A haiku must include a ''kigo'' which indicates which season the haiku is set in.<ref>[http://renku.home.att.net/500ESWd.html 500 Seasonal words]</ref><ref>[http://www.youngleaves.org/poetry/The%20Yuki%20Teikei%20Haiku%20Season%20Word%20List.htm Seasonal words from the 1977-78 Haiku Journal]</ref> |