diff --git a/README.md b/README.md
index 8ace1a9fa7bd2810a0a0ef1967e43fe66a234cf6..0d707d83911d518694455e15fbd1212aff609beb 100644
--- a/README.md
+++ b/README.md
@@ -159,7 +159,7 @@ Options:
   -ps, --positive-samples TEXT  Sample(s) in positive-vcf to consider. May be
                                 called multiple times  [required]
   -s, --stats PATH              Path to output stats json file
-  -dc, --discordant PATH        Path to output discordant VCF file
+  -dc, --discordant PATH        Path to output gzipped discordant vcf file
   -mq, --min-qual FLOAT         Minimum quality of variants to consider
   -md, --min-depth INTEGER      Minimum depth of variants to consider
   --help                        Show this message and exit.
diff --git a/vtools/cli.py b/vtools/cli.py
index 37ea32f78db3e7ed2b712167f4a73cf9bd561579..97ee6df2ed2c7a840d0248450ebfef4a84197751 100644
--- a/vtools/cli.py
+++ b/vtools/cli.py
@@ -35,7 +35,7 @@ from .gcoverage import RefRecord, region_coverages
 @click.option("-s", "--stats", type=click.Path(writable=True),
               help="Path to output stats json file")
 @click.option("-dvcf", "--discordant-vcf", type=click.Path(writable=True),
-              help="Path to output discordant VCF file",
+              help="Path to output gzipped discordant vcf file",
               required=False)
 @click.option("-mq", "--min-qual", type=float,
               help="Minimum quality of variants to consider", default=30)