During the late eighteenth and nineteenth century the tradition of koan-commentary became suppressed in the Sōtō-school, due to a reform movement that sought to standardise the procedures for dharma transmission. One reason for suppressing the koan-tradition in the Sōtō-school may have been to highlight the differences with the Rinzai-school, and create a clear identity. This movement also started to venerate Dogen as the founding teacher of the Sōtō-school. His teachings became the standard for the Sōtō-teachings, neglecting the fact that Dogen himself made extensive use of koan-commentary.