diff --git a/addons/br/nfse/extensions.go b/addons/br/nfse/extensions.go
index 07cbf99f..4dbe1faa 100644
--- a/addons/br/nfse/extensions.go
+++ b/addons/br/nfse/extensions.go
@@ -17,7 +17,7 @@ const (
 	ExtKeyISSLiability    = "br-nfse-iss-liability"
 	ExtKeyMunicipality    = "br-nfse-municipality"
 	ExtKeyService         = "br-nfse-service"
-	ExtKeySimplesNacional = "br-nfse-simples-nacional"
+	ExtKeySimples         = "br-nfse-simples"
 	ExtKeySpecialRegime   = "br-nfse-special-regime"
 )
 
@@ -176,9 +176,9 @@ var extensions = []*cbc.KeyDefinition{
 		},
 	},
 	{
-		Key: ExtKeySimplesNacional,
+		Key: ExtKeySimples,
 		Name: i18n.String{
-			i18n.EN: "Opting for “Simples Nacional”",
+			i18n.EN: "Opting for “Simples Nacional” regime",
 			i18n.PT: "Optante pelo Simples Nacional",
 		},
 		Values: []*cbc.ValueDefinition{
@@ -199,7 +199,9 @@ var extensions = []*cbc.KeyDefinition{
 		},
 		Desc: i18n.String{
 			i18n.EN: here.Doc(`
-				Indicates whether a party is opting for the “Simples Nacional” tax regime.
+				Indicates whether a party is opting for the “Simples Nacional” (Regime Especial
+				Unificado de Arrecadação de Tributos e Contribuições devidos pelas Microempresas e
+				Empresas de Pequeno Porte) tax regime
 
 				List of codes from the national NFSe ABRASF (v2.04) model:
 
diff --git a/addons/br/nfse/invoices.go b/addons/br/nfse/invoices.go
index a106a8cf..04e2ffcf 100644
--- a/addons/br/nfse/invoices.go
+++ b/addons/br/nfse/invoices.go
@@ -69,7 +69,7 @@ func validateSupplier(value interface{}) error {
 		),
 		validation.Field(&obj.Ext,
 			tax.ExtensionsRequires(
-				ExtKeySimplesNacional,
+				ExtKeySimples,
 				ExtKeyMunicipality,
 				ExtKeyFiscalIncentive,
 			),
diff --git a/addons/br/nfse/invoices_test.go b/addons/br/nfse/invoices_test.go
index bf491c06..050e5984 100644
--- a/addons/br/nfse/invoices_test.go
+++ b/addons/br/nfse/invoices_test.go
@@ -207,19 +207,19 @@ func TestSuppliersValidation(t *testing.T) {
 		}
 		err := addon.Validator(inv)
 		if assert.Error(t, err) {
-			assert.Contains(t, err.Error(), "br-nfse-simples-nacional: required")
+			assert.Contains(t, err.Error(), "br-nfse-simples: required")
 			assert.Contains(t, err.Error(), "br-nfse-municipality: required")
 			assert.Contains(t, err.Error(), "br-nfse-fiscal-incentive: required")
 		}
 
 		sup.Ext = tax.Extensions{
-			nfse.ExtKeySimplesNacional: "1",
+			nfse.ExtKeySimples:         "1",
 			nfse.ExtKeyMunicipality:    "12345678",
 			nfse.ExtKeyFiscalIncentive: "2",
 		}
 		err = addon.Validator(inv)
 		if assert.Error(t, err) {
-			assert.NotContains(t, err.Error(), "br-nfse-simples-nacional: required")
+			assert.NotContains(t, err.Error(), "br-nfse-simples: required")
 			assert.NotContains(t, err.Error(), "br-nfse-municipality: required")
 			assert.NotContains(t, err.Error(), "br-nfse-fiscal-incentive: required")
 		}
diff --git a/data/addons/br-nfse-v1.json b/data/addons/br-nfse-v1.json
index c74084ca..6d9ad191 100644
--- a/data/addons/br-nfse-v1.json
+++ b/data/addons/br-nfse-v1.json
@@ -125,13 +125,13 @@
       }
     },
     {
-      "key": "br-nfse-simples-nacional",
+      "key": "br-nfse-simples",
       "name": {
-        "en": "Opting for “Simples Nacional”",
+        "en": "Opting for “Simples Nacional” regime",
         "pt": "Optante pelo Simples Nacional"
       },
       "desc": {
-        "en": "Indicates whether a party is opting for the “Simples Nacional” tax regime.\n\nList of codes from the national NFSe ABRASF (v2.04) model:\n\n* https://abrasf.org.br/biblioteca/arquivos-publicos/nfs-e-manual-de-orientacao-do-contribuinte-2-04/download\n(Section 10.2, Field B-67)"
+        "en": "Indicates whether a party is opting for the “Simples Nacional” (Regime Especial\nUnificado de Arrecadação de Tributos e Contribuições devidos pelas Microempresas e\nEmpresas de Pequeno Porte) tax regime\n\nList of codes from the national NFSe ABRASF (v2.04) model:\n\n* https://abrasf.org.br/biblioteca/arquivos-publicos/nfs-e-manual-de-orientacao-do-contribuinte-2-04/download\n(Section 10.2, Field B-67)"
       },
       "values": [
         {
diff --git a/examples/br/invoice-services.json b/examples/br/invoice-services.json
index 9c985ff7..dc49ef87 100644
--- a/examples/br/invoice-services.json
+++ b/examples/br/invoice-services.json
@@ -41,7 +41,7 @@
     "ext": {
       "br-nfse-municipality": "3304557",
       "br-nfse-fiscal-incentive": "1",
-      "br-nfse-simples-nacional": "1",
+      "br-nfse-simples": "1",
       "br-nfse-special-regime": "4"
     }
   },
diff --git a/examples/br/out/invoice-services.json b/examples/br/out/invoice-services.json
index d93efb63..f87919ea 100644
--- a/examples/br/out/invoice-services.json
+++ b/examples/br/out/invoice-services.json
@@ -4,7 +4,7 @@
 		"uuid": "8a51fd30-2a27-11ee-be56-0242ac120002",
 		"dig": {
 			"alg": "sha256",
-			"val": "6b9933fc6209359b95583878eb64c358ac1b9028727c3e992ec4e78f7a196687"
+			"val": "d7ef87ccb18475563f8ce2aa804cd51e46b94c3adc6af2bb0867a72f13ad5ac1"
 		}
 	},
 	"doc": {
@@ -52,7 +52,7 @@
 			"ext": {
 				"br-nfse-fiscal-incentive": "1",
 				"br-nfse-municipality": "3304557",
-				"br-nfse-simples-nacional": "1",
+				"br-nfse-simples": "1",
 				"br-nfse-special-regime": "4"
 			}
 		},