After the establishment of haiku, when the traditional group literature of renga was composed as modern literature, it came to be called renku (a linked verse) in order to distinguish it from haiku.
俳句の成立以降は、伝統的な座の文芸たる連歌の俳諧を近代文芸として行うとき、俳句とは区別するためこれを連句と呼ぶようになった。