His affidavit is in part as follows: “On September 23, 1975, the entire principal debt mentioned above was renewed and extended… In claiming that the debt had been “renewed and extended,” Giese made only one legal conclusion. A legal conclusion in an affidavit is not sufficient to raise a factual issue in response to a request for summary judgment or to establish the existence of a fact in support of an application for summary judgment. . . .