diff --git a/docs/book/src/developers/development.md b/docs/book/src/developers/development.md
index 5d1c1cbe92f..a116c65c2fb 100644
--- a/docs/book/src/developers/development.md
+++ b/docs/book/src/developers/development.md
@@ -531,7 +531,7 @@ Optional settings are:
 | `WINDOWS`            | `false`       | Run conformance against Windows nodes                                                              |
 | `CONFORMANCE_NODES`  | `1`           | Number of parallel ginkgo nodes to run                                                             |
 | `CONFORMANCE_FLAVOR` | `""`          | The flavor of the cluster to run conformance against. If not set, the default flavor will be used. |
-| `IPV6`               | `false`       | Run conformance against IPv6 nodes                                                                 |
+| `IP_FAMILY`               | `IPv4`       | Set to `IPv6` to run conformance against IPv6 nodes                                                                 |
 
 With the following environment variables defined, you can build a CAPZ cluster from the HEAD of Kubernetes main branch or release branch, and run the Conformance test suite against it.