It was not an agreement with Canada, but with the Action démocratique under Mario Dumont. The referendum question was on that agreement. These people are afraid of clarity. Their leader, Parizeau, spent the whole summer saying he wanted to trap Quebecers like lobsters, and use lots of tricks and tactics to confuse people. Parizeau was even ready to make a unilateral declaration of independence after he had refused to use the word country in the referendum question.
In the House of Commons on February 17th, 2000. See this statement in context.