diff --git a/Documentation/netlink/specs/rt-link.yaml b/Documentation/netlink/specs/rt-link.yaml
index 6ab9b876a464..4b51c5b60d95 100644
--- a/Documentation/netlink/specs/rt-link.yaml
+++ b/Documentation/netlink/specs/rt-link.yaml
@@ -1447,6 +1447,8 @@ attribute-sets:
         type: indexed-array
         sub-type: binary
         display-hint: ipv6
+        checks:
+          exact-len: 16
       -
         name: coupled-control
         type: u8