killbill-aplcache

diff --git a/invoice/src/main/java/com/ning/billing/invoice/notification/EmailInvoiceNotifier.java b/invoice/src/main/java/com/ning/billing/invoice/notification/EmailInvoiceNotifier.java
index 4a58ab3..27b9541 100644
--- a/invoice/src/main/java/com/ning/billing/invoice/notification/EmailInvoiceNotifier.java
+++ b/invoice/src/main/java/com/ning/billing/invoice/notification/EmailInvoiceNotifier.java
@@ -64,8 +64,7 @@ public class EmailInvoiceNotifier implements InvoiceNotifier {
             throw new InvoiceApiException(e, ErrorCode.EMAIL_SENDING_FAILED);
         }
 
-        // TODO: get subject
-        final String subject = "";
+        final String subject = config.getInvoiceEmailSubject();
 
         final EmailSender sender = new DefaultEmailSender(config);
         try {

diff --git a/util/src/main/java/com/ning/billing/util/email/EmailConfig.java b/util/src/main/java/com/ning/billing/util/email/EmailConfig.java
index 2d9a583..675b2ab 100644
--- a/util/src/main/java/com/ning/billing/util/email/EmailConfig.java
+++ b/util/src/main/java/com/ning/billing/util/email/EmailConfig.java
@@ -50,4 +50,8 @@ public interface EmailConfig extends KillbillConfig {
     @Config("killbill.mail.useSSL")
     @Default("false")
     boolean useSSL();
+
+    @Config("killbill.mail.invoiceEmailSubject")
+    @Default("Your invoice")
+    String getInvoiceEmailSubject();
 }