diff --git a/README.md b/README.md
index 4957087..3769b0d 100644
--- a/README.md
+++ b/README.md
@@ -11,11 +11,12 @@ Dependencies:
 * Python 3 (tested on version 3.6.9)
 * [gramtools](https://github.com/iqbal-lab-org/gramtools) commit
   9313eceb606a6fc159e4a14c168b7a6f888c5ed2
+* [bcftools](https://samtools.github.io/bcftools/)
 * [vt](https://github.com/atks/vt.git)
 * [vcflib](https://github.com/vcflib/vcflib.git). Specifically,
   either `vcflib`, or all three of
   `vcfbreakmulti`, `vcfallelicprimitives`, and `vcfuniq` must be installed.
-* Optionally, [nextflow](https://www.nextflow.io/), if you want to use the
+* Optionally, [nextflow](https://www.nextflow.io/) and [ivcfmerge](https://github.com/iqbal-lab-org/ivcfmerge) if you want to use the
   pipeline to regenotype a large number of samples.
 
 Install by cloning this repository (or downloading the latest release), and