diff --git a/README.md b/README.md
index 15febf5..1799ed4 100644
--- a/README.md
+++ b/README.md
@@ -424,6 +424,7 @@ The following types are supported:
 - string: Any string
 - boolean: The values 'true' or 'false'
 - enum: A value from the predefined enumValues array
+- date: ISO 8601 compliant date where only the date portion is intended to be used: https://github.com/buildingSMART/foundation-API#17-datetime-format
 - date-time: ISO 8601 compliant date: https://github.com/buildingSMART/foundation-API#17-datetime-format
 
 ### 3.1.5 Expressing User Authorization Through Project Extensions
diff --git a/swagger.yaml b/swagger.yaml
index 44d2997..ff05438 100644
--- a/swagger.yaml
+++ b/swagger.yaml
@@ -2807,6 +2807,8 @@ components:
     project_custom_field_extension:
       type: object
       additionalProperties: true
+      required:
+        - minArraySize
       properties:
         id:
           type: string