diff --git a/third_party/terraform/website/docs/r/container_node_pool.html.markdown b/third_party/terraform/website/docs/r/container_node_pool.html.markdown
index 189400d40af4..f64c49e24bf3 100644
--- a/third_party/terraform/website/docs/r/container_node_pool.html.markdown
+++ b/third_party/terraform/website/docs/r/container_node_pool.html.markdown
@@ -188,6 +188,8 @@ The `upgrade_settings` block supports:
     an upgrade. Increasing `max_unavailable` raises the number of nodes that can be upgraded in
     parallel. Can be set to 0 or greater.
 
+`max_surge` and `max_unavailable` must not be negative and at least one of them must be greater than zero.
+
 <a id="timeouts"></a>
 ## Timeouts