diff --git a/README.md b/README.md
index 765b426..7c00af6 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,4 @@ Importable Golang bindings for nbdkit, extracted from official libguestfs.org re
 
 This repository includes all the auto-generated golang files from the official libguestfs.org releases of nbdkit, so that the bindings can be imported with `go.mod` or `go get`. This is intended as a temporary measure to allow [CDI](https://github.com/kubevirt/containerized-data-importer) to make use of nbdkit plugins for functional tests.
 
+Requires a minimum of nbdkit version 1.20.