diff --git a/text/0025-purchase-order.md b/text/0025-purchase-order.md
index efee805..3447e44 100644
--- a/text/0025-purchase-order.md
+++ b/text/0025-purchase-order.md
@@ -430,6 +430,8 @@ IDs included in the `PurchaseOrder` should refer to the same organizations.
 - `uid` - Unique identifier for Purchase Order
 - `workflow_status` - Workflow status. Values are defined by the smart contract
 workflows
+- `workflow_type` - Workflow type. The name of the workflow that the Purchase
+Order will proceed through.
 - `buyer_org_id` - Grid Pike organization ID associated with the buying
 organization defined by the XML in the purchase order's `order_xml_v3_4` field.
 - `seller_org_id` - Grid Pike organization ID associated with the selling
@@ -444,12 +446,13 @@ accepted
 message PurchaseOrder {
   required string uid = 1;
   required string workflow_status = 2;
-  string buyer_org_id = 3;
-  string seller_org_id = 4;
-  repeated PurchaseOrderVersion versions = 5;
-  string accepted_version_number = 6;
-  uint64 created_at = 7;
-  bool is_closed = 8;
+  required string workflow_type = 3;
+  string buyer_org_id = 4;
+  string seller_org_id = 5;
+  repeated PurchaseOrderVersion versions = 6;
+  string accepted_version_number = 7;
+  uint64 created_at = 8;
+  bool is_closed = 9;
 }
 ```
 
@@ -561,12 +564,16 @@ message PurchaseOrderPayload {
   UpdateVersionPayload update_version_payload = 6;
 }
 
+*`workflow_status` must refer to a valid workflow status for this purchase
+order as defined by its workflow type.*
+
 message CreatePurchaseOrderPayload {
   string uid = 1;
   uint64 created_at = 2;
   string buyer_org_id = 3;
   string seller_org_id = 4;
-  CreateVersionPayload create_version_payload = 5;
+  string workflow_status = 5;
+  CreateVersionPayload create_version_payload = 6;
 }
 
 message UpdatePurchaseOrderPayload {
@@ -576,11 +583,15 @@ message UpdatePurchaseOrderPayload {
   string accepted_version_number = 4;
 }
 
+*`workflow_status` must refer to a valid workflow status for this purchase
+order version as defined by its workflow type.*
+
 message CreateVersionPayload {
   string version_id = 1;
   string po_uid = 2;
   bool is_draft = 3;
-  PayloadRevision revision = 4;
+  string workflow_status = 4;
+  PayloadRevision revision = 5;
 }
 
 message UpdateVersionPayload {