A documentary made by families of Tiananmen crackdown victims is a testament to the courage and persistence required by those still searching for the truth 20 years on. And for the producers of Road of Tiananmen Mothers, Jiang Peikun and his wife Ding Zilin, founder of the group Tiananmen Mothers, the completion of the 100-minute film was almost a miracle. The documentary, released last week, just ahead of the 20th anniversary of the crackdown on student protesters, depicts how the Tiananmen Mothers fought for truth and fair treatment over the past two decades. Ms Ding, whose 17-year-old son, Jiang Jielian , was shot dead on the night of June 3, 1989, while participating in the protest, said the documentary was an effort to record history and the truth. 'It has been 20 years now and it's time that we face reality - it may not be possible to achieve what we have demanded in our lifetime,' she said. The Tiananmen Mothers tallied the death toll in the crackdown and demanded a reassessment of the official verdict on the student movement. Last week the group said it had confirmed 195 deaths with victims' families. 'We should record every fact, so that people in the future will have a chance to better understand this part of history,' Ms Ding said. The documentary was in jeopardy after Mr Jiang suffered a serious stroke in November, which Ms Ding said was induced by a police raid on their home in southern China. 'He had already written most of the script before the stroke,' said Ms Ding, a 73-year-old retired professor of philosophy. 'Production would be impossible without him because he is the only one who knows how to use a computer.' The documentary was made possible with post-production assistance from Hong Kong's Tiananmen Mothers group. Unable to travel abroad and with limited rights to receive visitors, the group transferred production materials such as pictures and scripts online. Mr Jiang, a former professor of aesthetics, spent five days in a coma. When he woke, his lower body was paralysed, he had memory difficulties and he struggled with speech. 'When he woke up, he still muttered about the script. He said he still hadn't finished it,' Ms Ding said. 'After we returned to our Beijing home, one day he sat in front of the computer for two hours without moving, because he could not remember the password.' Although doctors gave a gloomy prognosis, saying Mr Jiang could be permanently paralysed, the 76-year-old proved them wrong. Ms Ding said Mr Jiang slowly recovered and soon resumed work on the documentary. He can now walk freely but speaks with less fluency and clarity than before. The documentary consists largely of pictures of members' activities and video clips of interviews over the past 20 years. A DVD of the documentary will be available at tonight's candle-light vigil in Victoria Park.