add a note in doc

GoogleCloudPlatform · Nov 27, 2019 · 9e51865 · 9e51865
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commit 9e51865
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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
@@ -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