diff --git a/pyinvoice/models.py b/pyinvoice/models.py
index 49bbf5e..7a4d171 100644
--- a/pyinvoice/models.py
+++ b/pyinvoice/models.py
@@ -139,7 +139,7 @@ class Transaction(object):
         :param transaction_datetime:
         :type transaction_datetime: date or datetime or str or unicode
         :param amount: $$
-        :type amount: int or str or unicode
+        :type amount: int or float or str or unicode
         :return:
         """
         self.gateway = gateway
diff --git a/pyinvoice/templates.py b/pyinvoice/templates.py
index 99df5ad..bd0b0c4 100644
--- a/pyinvoice/templates.py
+++ b/pyinvoice/templates.py
@@ -249,8 +249,7 @@ class SimpleInvoice(SimpleDocTemplate):
         if item_data:
             self._story.append(TableWithHeader(item_data, horizontal_align='LEFT', style=style))
 
-    def _build_transactions(self):
-        # Transaction
+    def _transactions_data(self):
         transaction_table_data = [
             (
                 t.transaction_id,
@@ -261,10 +260,16 @@ class SimpleInvoice(SimpleDocTemplate):
         ]
 
         if transaction_table_data:
-            self._story.append(
-                Paragraph('Transaction', self._defined_styles.get('Heading1'))
-            )
             transaction_table_data.insert(0, ('Transaction id', 'Gateway', 'Transaction date', 'Amount'))
+
+        return transaction_table_data
+
+    def _build_transactions(self):
+        # Transaction
+        transaction_table_data = self._transactions_data()
+
+        if transaction_table_data:
+            self._story.append(Paragraph('Transaction', self._defined_styles.get('Heading1')))
             self._story.append(TableWithHeader(transaction_table_data, horizontal_align='LEFT'))
 
     def _build_bottom_tip(self):
diff --git a/tests/test_templates.py b/tests/test_templates.py
index e355e95..d6db30d 100644
--- a/tests/test_templates.py
+++ b/tests/test_templates.py
@@ -251,4 +251,29 @@ class TestSimpleInvoice(unittest.TestCase):
 
         invoice.finish()
 
-        self.assertTrue(os.path.exists(invoice_path))
\ No newline at end of file
+        self.assertTrue(os.path.exists(invoice_path))
+
+    def test_transaction(self):
+        invoice_path = os.path.join(self.file_base_dir, 'transaction.pdf')
+        if os.path.exists(invoice_path):
+            os.remove(invoice_path)
+
+        invoice = SimpleInvoice(invoice_path)
+
+        transaction_data = invoice._transactions_data()
+        self.assertEqual(transaction_data, [])
+
+        invoice.add_transaction(Transaction('A', 1, date.today(), 9.9))
+        invoice.add_transaction(Transaction('B', 3, date(2015, 6, 1), 3.3))
+
+        transaction_data = invoice._transactions_data()
+        self.assertEqual(len(transaction_data), 3)
+        self.assertEqual(transaction_data[0][0], 'Transaction id')
+        self.assertEqual(transaction_data[1][3], 9.9)
+        self.assertEqual(transaction_data[2][0], 3)
+        self.assertEqual(transaction_data[2][2], '2015-06-01')
+        self.assertEqual(transaction_data[2][3], 3.3)
+
+        invoice.finish()
+
+        self.assertTrue(os.path.exists(invoice_path))