- * <type> is either:
- * gzip: compress revisions independently
- * concat: concatenate revisions and compress in chunks (default)
- *
- * <start-id> is the old_id to start from
- *
- * The following options apply only to the concat type:
- * <begin-date> is the earliest date to check for uncompressed revisions
- * <end-date> is the latest revision date to compress
- * <chunk-size> is the maximum number of revisions in a concat chunk
- * <max-factor> is the maximum ratio of compressed chunk bytes to uncompressed avg. revision bytes
- * <factor-threshold> is a minimum number of KB, where <max-factor> cuts in
+ * Options are:
+ * -t <type> set compression type to either:
+ * gzip: compress revisions independently
+ * concat: concatenate revisions and compress in chunks (default)
+ * -c <chunk-size> maximum number of revisions in a concat chunk
+ * -b <begin-date> earliest date to check for uncompressed revisions
+ * -e <end-date> latest revision date to compress
+ * -s <start-id> the old_id to start from
+ * -f <max-factor> the maximum ratio of compressed chunk bytes to uncompressed avg. revision bytes
+ * -h <threshold> is a minimum number of KB, where <max-factor> cuts in
+ * --extdb <cluster> store specified revisions in an external cluster (untested)