What is significant about the notice in this verse?

The passage ends, He judged Israel in the days of the Philistines twenty years. Normally this notice comes at the very end of a judgeship. So the placement here might seem odd, because there is still another chapter to go. Well, this notice marks an end to the first cycle of conflict with the Philistines—a cycle that spanned chapters 14 and 15 (the wedding, riddle, settling of the riddle, burning of the Philistines’ fields, the slaughter with the donkey’s jawbone). This all appears to have happened at the beginning of Samson’s twenty-year judgeship. The jawbone episode is perhaps a rite of passage for Samson, as the beginning of his career as a judge.^1,2