diff --git a/CRM/Tbusainvoicegen/Timebank.php b/CRM/Tbusainvoicegen/Timebank.php
index e2a8ff7..c050576 100644
--- a/CRM/Tbusainvoicegen/Timebank.php
+++ b/CRM/Tbusainvoicegen/Timebank.php
@@ -11,16 +11,18 @@ class CRM_Tbusainvoicegen_Timebank {
   const DUEDATE = 'custom_245';
   const PERIODBEGIN = 'custom_246';
   const PERIODEND = 'custom_247';
+  const BILLABLEMEMBERSCONTRIB = 'custom_249';
 
   // Local dev settings.
-//  const TBBILLABLEFIELD = 'custom_9';
-//  const BILLABLEMEMBERFIELD = 'custom_10';
-//  const BILLINGPERIODFIELD = 'custom_11';
-//  const TBCREATED = 'custom_27';
-//  const INVOICEDATE = 'custom_30';
-//  const DUEDATE = 'custom_31';
-//  const PERIODBEGIN = 'custom_32';
-//  const PERIODEND = 'custom_33';
+//  const TBBILLABLEFIELD = 'custom_14';
+//  const BILLABLEMEMBERFIELD = 'custom_15';
+//  const BILLINGPERIODFIELD = 'custom_7';
+//  const TBCREATED = 'custom_16';
+//  const INVOICEDATE = 'custom_9';
+//  const DUEDATE = 'custom_11';
+//  const PERIODBEGIN = 'custom_12';
+//  const PERIODEND = 'custom_13';
+//  const BILLABLEMEMBERSCONTRIB = 'custom_8';
 
   /**
    * Set the pricing here.
@@ -242,6 +244,7 @@ class CRM_Tbusainvoicegen_Timebank {
       self::INVOICEDATE => $this->invoiceDate->format('Y-m-d'),
       self::PERIODBEGIN => $this->periodBegin->format('Y-m-d'),
       self::PERIODEND => $this->periodEnd->format('Y-m-d'),
+      self::BILLABLEMEMBERSCONTRIB => $this->memberCount,
       'total_amount' => $this->price,
       'contact_id' => $this->cid,
       'contribution_status_id' => 'Pending',