-" -c<n> Auto-enable compaction of the oldest generation when live data is",
-" at least <n>% of the maximum heap size set with -M (default: 30%)",
-" -c Enable compaction for all major collections",
+" -c<n> Use in-place compaction instead of copying in the oldest generation",
+" when live data is at least <n>% of the maximum heap size set with",
+" -M (default: 30%)",
+" -c Use in-place compaction for all oldest generation collections",
+" (the default is to use copying)",