diff --git a/doc/api/subnet6-add.json b/doc/api/subnet6-add.json
index bd477eb1f3da5d72c736f0476b9f135ca1eeac53..727241f2462d6c689e03954d6480c0c604ca289e 100644
--- a/doc/api/subnet6-add.json
+++ b/doc/api/subnet6-add.json
@@ -2,7 +2,7 @@
     "name": "subnet6-add",
     "brief": "This command is used to create and add new subnet to the existing server configuration. This operation has no impact on other subnets.",
     "description": "See <xref linkend=\"idp70\"/>",
-    "support": [ "kea-dhcp4", "kea-dhcp6" ],
+    "support": [ "kea-dhcp6" ],
     "avail": "1.3.0",
     "hook": "subnet_cmds",
     "cmd-syntax": "{