diff --git a/doc/Comercio_Digital/ComercioDigital_Cancela_CFDI.pdf b/doc/Comercio_Digital/ComercioDigital_Cancela_CFDI.pdf
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index 0000000..2f0386c
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diff --git a/doc/Comercio_Digital/ComercioDigital_Cancela_XML.pdf b/doc/Comercio_Digital/ComercioDigital_Cancela_XML.pdf
new file mode 100644
index 0000000..fbbbe99
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diff --git a/doc/Comercio_Digital/ComercioDigital_Consulta.pdf b/doc/Comercio_Digital/ComercioDigital_Consulta.pdf
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diff --git a/source/comerciodigital/comercio.py b/source/comerciodigital/comercio.py
index 7cfe984..0b2b47b 100644
--- a/source/comerciodigital/comercio.py
+++ b/source/comerciodigital/comercio.py
@@ -167,7 +167,7 @@ class PACComercioDigital(object):
             f"PWDK={info['pass']}",
             f"KEYF={info['key']}",
             f"CERT={info['cer']}",
-            f"TIPO={info['tipo']}",
+            f"TIPO={info['tipo']}",  # cfdi3.3 o reten1.0
             f"ACUS=SI",
             f"RFCR={rfc_receptor}",
             f"TIPOC={tipo}",
@@ -201,7 +201,7 @@ class PACComercioDigital(object):
             'tdf': 'http://www.sat.gob.mx/TimbreFiscalDigital',
         }
         tree = ET.fromstring(cfdi.encode())
-        tipo = tree.xpath(
+        tipocfdi = tree.xpath(
             'string(//cfdi:Comprobante/@TipoDeComprobante)',
             namespaces=NS_CFDI)
         total = tree.xpath(
@@ -216,7 +216,7 @@ class PACComercioDigital(object):
             'pwdws': auth['pass'],
             'rfcr': rfc_receptor,
             'total': total,
-            'tipocfdi': tipo,
+            'tipocfdi': tipocfdi,
         }
         headers.update(info)