diff --git a/CHANGELOG_PENDING.md b/CHANGELOG_PENDING.md
index 80b326a9..db5b3070 100644
--- a/CHANGELOG_PENDING.md
+++ b/CHANGELOG_PENDING.md
@@ -3,3 +3,6 @@
 - [features] add "pulumi.organiztion" to the built-in "pulumi" variable to obtain the current organization.
 
 ### Bug Fixes
+
+- Parse the items property on config type declarations to prevent diagnostic messages about
+  unknown fields [#615](https://github.com/pulumi/pulumi-yaml/pull/615)
diff --git a/pkg/pulumiyaml/ast/template.go b/pkg/pulumiyaml/ast/template.go
index 20f98884..3357e237 100644
--- a/pkg/pulumiyaml/ast/template.go
+++ b/pkg/pulumiyaml/ast/template.go
@@ -276,6 +276,7 @@ type ConfigParamDecl struct {
 	Secret  *BooleanExpr
 	Default Expr
 	Value   Expr
+	Items   *ConfigParamDecl
 }
 
 func (d *ConfigParamDecl) recordSyntax() *syntax.Node {
diff --git a/pkg/pulumiyaml/ast/template_test.go b/pkg/pulumiyaml/ast/template_test.go
index 8f64edd3..b8966c2d 100644
--- a/pkg/pulumiyaml/ast/template_test.go
+++ b/pkg/pulumiyaml/ast/template_test.go
@@ -16,6 +16,23 @@ import (
 const example = `
 name: simple-yaml
 runtime: yaml
+config:
+  some-string-array:
+    type: array
+    value:
+      - subnet1
+      - subnet2
+      - subnet3
+    items:
+      type: string
+  some-nested-array:
+    type: array
+    items:
+      type: array
+      items:
+        type: string
+  some-boolean:
+    type: boolean
 resources:
   my-bucket:
     type: aws:s3/bucket:Bucket