diff --git a/Tests/Recurly/Addon_Test.php b/Tests/Recurly/Addon_Test.php
index 8bd990fd..582554a6 100644
--- a/Tests/Recurly/Addon_Test.php
+++ b/Tests/Recurly/Addon_Test.php
@@ -5,7 +5,8 @@ class Recurly_AddonTest extends Recurly_TestCase
 {
   function defaultResponses() {
     return array(
-      array('GET', '/plans/gold/add_ons/ipaddresses', 'addons/show-200.xml')
+      array('GET', '/plans/gold/add_ons/ipaddresses', 'addons/show-200.xml'),
+      array('GET', '/plans/gold/add_ons/ipaddresses_revrec', 'addons/show-200-revrec.xml'),
     );
   }
 
@@ -19,6 +20,18 @@ public function testConstructor() {
     $this->assertSame($client, $prop->getValue($plan));
   }
 
+  public function testGetAddonWithRevRec() {
+    $addon = Recurly_Addon::get('gold', 'ipaddresses_revrec', $this->client);
+    $this->assertInstanceOf('Recurly_Addon', $addon);
+    $this->assertSame('ipaddresses_revrec', $addon->add_on_code);
+    $this->assertSame('IP Addresses', $addon->name);
+    $this->assertSame(200, $addon->unit_amount_in_cents->USD->amount_in_cents);
+    $this->assertSame(1, $addon->default_quantity);
+    $this->assertSame('udexyr9hjgkc', $addon->liability_gl_account_id);
+    $this->assertSame('uelq7rzkydlu', $addon->revenue_gl_account_id);
+    $this->assertSame('6', $addon->performance_obligation_id);
+  }
+
   public function testDelete() {
     $this->client->addResponse(
       'DELETE',
@@ -48,6 +61,29 @@ public function testCreateXmlItemBackedAddOn() {
       </add_on>", $addon->xml());
   }
 
+  public function testCreateXmlItemBackedAddOnWithRevRec() {
+    $item = new Recurly_Item();
+    $item->item_code = 'little_llama';
+    $addon = new Recurly_Addon();
+    $addon->plan_code = 'gold';
+    $addon->item_code = $item->item_code;
+    $addon->unit_amount_in_cents->addCurrency('USD', 400);
+    $addon->liability_gl_account_id = 'udexyr9hjgkc';
+    $addon->revenue_gl_account_id = 'uelq7rzkydlu';
+    $addon->performance_obligation_id = '6';
+
+    $this->assertXmlStringEqualsXmlString("
+      <add_on>
+        <item_code>little_llama</item_code>
+        <unit_amount_in_cents>
+          <USD>400</USD>
+        </unit_amount_in_cents>
+        <liability_gl_account_id>udexyr9hjgkc</liability_gl_account_id>
+        <revenue_gl_account_id>uelq7rzkydlu</revenue_gl_account_id>
+        <performance_obligation_id>6</performance_obligation_id>
+      </add_on>", $addon->xml());
+  }
+
   public function testCreateXmlTieredAddOn() {
     $item = new Recurly_Item();
     $addon = new Recurly_Addon();
diff --git a/Tests/fixtures/addons/show-200-revrec.xml b/Tests/fixtures/addons/show-200-revrec.xml
new file mode 100644
index 00000000..21b73c45
--- /dev/null
+++ b/Tests/fixtures/addons/show-200-revrec.xml
@@ -0,0 +1,22 @@
+HTTP/1.1 200 OK
+Content-Type: application/xml; charset=utf-8
+ETag: "a81253e90a4f16089b951028675c58d2"
+
+<?xml version="1.0" encoding="UTF-8"?>
+<add_on href="https://api.recurly.com/v2/plans/gold/add_ons/ipaddresses_revrec">
+  <plan href="https://api.recurly.com/v2/plans/gold"/>
+  <add_on_code>ipaddresses_revrec</add_on_code>
+  <name>IP Addresses</name>
+  <display_quantity_on_hosted_page type="boolean">false</display_quantity_on_hosted_page>
+  <default_quantity type="integer">1</default_quantity>
+  <unit_amount_in_cents>
+    <USD type="integer">200</USD>
+  </unit_amount_in_cents>
+  <measured_unit_id>123456</measured_unit_id>
+  <add_on_type>usage</add_on_type>
+  <usage_type>price</usage_type>
+  <liability_gl_account_id>udexyr9hjgkc</liability_gl_account_id>
+  <revenue_gl_account_id>uelq7rzkydlu</revenue_gl_account_id>
+  <performance_obligation_id>6</performance_obligation_id>
+  <created_at type="datetime">2011-06-28T12:34:56Z</created_at>
+</add_on>
diff --git a/lib/recurly/addon.php b/lib/recurly/addon.php
index 2f71fe71..e1bbf63b 100644
--- a/lib/recurly/addon.php
+++ b/lib/recurly/addon.php
@@ -21,6 +21,9 @@
  * @property float $usage_percentage If add_on_type = usage and usage_type = percentage, you must set a usage_percentage. Must be between 0.0000 and 100.0000. If item_code is present, usage_percentage must be absent.
  * @property string $usage_calculation_type The method of calculation used for usage-based add-ons with type 'price'.  Can be 'cumulative' or 'last_in_period'.  If no type is selected, type 'cumulative' will apply.
  * @property string $revenue_schedule_type Optional field for setting a revenue schedule type. This will determine how revenue for the associated Plan should be recognized. When creating a Plan, if you supply an end_date and end_date available schedule types are never, evenly, at_range_start, or at_range_end. If item_code is present, revenue_schedule_type must be absent.
+ * @property string $liability_gl_account_id The ID of the liability general ledger account associated with the add on.
+ * @property string $revenue_gl_account_id The ID of the revenue general ledger account associated with the add on.
+ * @property string $performance_obligation_id The ID of the performance obligation associated with the add on.
  * @property DateTime $created_at The date and time the add-on was created.
  * @property DateTime $updated_at The date and time the add-on was last updated.
  * @property string $plan_code Unique code to identify the plan.
@@ -70,7 +73,8 @@ protected function getWriteableAttributes() {
       'add_on_code', 'item_code', 'name', 'display_quantity', 'default_quantity',
       'unit_amount_in_cents', 'accounting_code', 'tax_code', 'usage_timeframe', 'usage_calculation_type',
       'measured_unit_id', 'usage_type', 'usage_percentage', 'add_on_type', 'revenue_schedule_type',
-      'optional', 'display_quantity_on_hosted_page', 'tier_type', 'tiers', 'percentage_tiers'
+      'optional', 'display_quantity_on_hosted_page', 'tier_type', 'tiers', 'percentage_tiers', 'liability_gl_account_id',
+      'revenue_gl_account_id', 'performance_obligation_id'
     );
   }
 }