+.TP
+.B -h
+Print the header/meta lines.
+.TP
+.B -B
+The second argument is a BED file. When this option is in use, the input
+file may not be sorted or indexed. The entire input will be read sequentially. Nonetheless,
+with this option, the format of the input must be specificed correctly on the command line.
+.TP
+.B -f
+Force to overwrite the index file if it is present.
+.TP
+.B -l
+List the sequence names stored in the index file.