diff --git a/scripts/aln2basecnt b/scripts/aln2basecnt
index ad0f5f7..baa7565 100755
--- a/scripts/aln2basecnt
+++ b/scripts/aln2basecnt
@@ -48,7 +48,7 @@ def parse_args():
                         type=str, dest='alpha', help='alphabet to use')
     parser.add_argument('-f', '--first', metavar='ARRAY_BASE', required=False,
                         default=0, choices=[0,1],
-                        type=int, dest='first', help='select whether the first position is named "0" (standard for python tools such as pysam and older versions of smallgenomeutilities) or "1" (standard scientific notation used in most tools)')
+                        type=int, dest='first', help='select whether the first position is named "0" (standard for python tools such as pysam, older versions of smallgenomeutilities, and the BED format) or "1" (standard scientific notation used in most tools, and most text formats such as VCF and GFF)')
     parser.add_argument('-s', '--stats', metavar='YAML/JSON/INI', required=False,
                         type=str, dest='stats', help="file to write stats to")
     parser.add_argument("FILE", nargs=1, metavar='BAM/CRAM', help="alignment file")
diff --git a/scripts/extract_coverage_intervals b/scripts/extract_coverage_intervals
index b872c0a..2ede8bb 100755
--- a/scripts/extract_coverage_intervals
+++ b/scripts/extract_coverage_intervals
@@ -36,7 +36,7 @@ def parse_args():
     )
     parser.add_argument(
         "-b", "--based", "--first", required=False, default=0, choices=[0, 1], type=int, metavar='INPUTBASED', dest='based',
-        help="Specifies whether the input TSV is 0-based (as used by python tools such as pysam) or 1-based (as standard notation in genetics), and thus should be converted before outputing the 0-based output."
+        help="Specifies whether the input TSV is 0-based (as used by python tools such as pysamm, or in BED files) or 1-based (as standard notation in genetics, or in VCF files), and thus should be converted before outputing the 0-based output."
              "are interpreted using 0-based indexing, and a half-open "
              "interval is used, i.e, [start:end)"
     )