diff --git a/brado/src/certidao.rs b/brado/src/certidao.rs
index 14061fc..aad5fbe 100644
--- a/brado/src/certidao.rs
+++ b/brado/src/certidao.rs
@@ -73,10 +73,9 @@ fn generate_digit(doc_slice: &[u16]) -> u16 {
 
     let rest: u16 = d % 11;
 
-    if rest > 9 {
-        1
-    } else {
-        rest
+    match rest > 9 {
+        true => 1,
+        false => rest,
     }
 }
 
diff --git a/brado/src/cnh.rs b/brado/src/cnh.rs
index 5743219..b276d48 100644
--- a/brado/src/cnh.rs
+++ b/brado/src/cnh.rs
@@ -67,10 +67,9 @@ fn generate_first_digit(doc_slice: &[u16]) -> (u16, u16) {
 
     let rest: u16 = sum % 11;
 
-    if rest >= 10 {
-        (0, 2)
-    } else {
-        (rest, 0)
+    match rest >= 10 {
+        true => (0, 2),
+        false => (rest, 0),
     }
 }
 
@@ -85,16 +84,14 @@ fn generate_second_digit(
     }
 
     let rest: u16 = sum % 11;
-    let second: u16 = if rest >= dsc {
-        rest - dsc
-    } else {
-        11 + rest - dsc
+    let second: u16 = match rest >= dsc {
+        true => rest - dsc,
+        false => 11 + rest - dsc,
     };
 
-    if second >= 10 {
-        0
-    } else {
-        second
+    match second >= 10 {
+        true => 0,
+        false => second,
     }
 }
 
diff --git a/brado/src/cnpj.rs b/brado/src/cnpj.rs
index 7b80109..8d85521 100644
--- a/brado/src/cnpj.rs
+++ b/brado/src/cnpj.rs
@@ -4,6 +4,15 @@ use crate::common::{get_digits, get_symbols, random_digit_vector, to_decimal};
 
 const CNPJ_SIZE: usize = 14;
 
+/// Converte um caractere em um dígito válido de CNPJ.
+///
+/// CNPJ Alfanumérico: SS.SSS.SSS/SSSS-NN,
+/// onde N: Número; S: Letra ou Número.
+///
+/// A validação permanece igual, porém, é necessário
+/// substituir os caracteres pelos valores respectivos
+/// da tabela ASCII e dele subtrair 48. Assim, '0'=0,
+/// '1'=1, ..., 'A'=17, 'B'=18, ...
 fn to_cnpj_digit(
     i: usize,
     c: char,
diff --git a/brado/src/eleitoral.rs b/brado/src/eleitoral.rs
index e1ff526..571d705 100644
--- a/brado/src/eleitoral.rs
+++ b/brado/src/eleitoral.rs
@@ -68,10 +68,9 @@ fn generate_first_digit(doc_slice: &[u16]) -> u16 {
 
     let rest: u16 = sum % 11;
 
-    if rest == 10 {
-        0
-    } else {
-        rest
+    match rest {
+        10 => 0,
+        _ => rest,
     }
 }
 
@@ -92,10 +91,9 @@ fn generate_second_digit(
 
     let rest: u16 = sum % 11;
 
-    if rest == 10 {
-        0
-    } else {
-        rest
+    match rest {
+        10 => 0,
+        _ => rest,
     }
 }
 
diff --git a/brado/src/nis.rs b/brado/src/nis.rs
index 3e8b548..03f8841 100644
--- a/brado/src/nis.rs
+++ b/brado/src/nis.rs
@@ -67,10 +67,9 @@ fn generate_digit(doc_slice: &[u16]) -> u16 {
 
     let rest: u16 = sum % 11;
 
-    if rest >= 2 {
-        11 - rest
-    } else {
-        0
+    match rest >= 2 {
+        true => 11 - rest,
+        false => 0,
     }
 }
 
diff --git a/brado/src/renavam.rs b/brado/src/renavam.rs
index 9a3241e..4eb9dd1 100644
--- a/brado/src/renavam.rs
+++ b/brado/src/renavam.rs
@@ -61,10 +61,9 @@ fn generate_digit(doc_slice: &[u16]) -> u16 {
 
     let rest: u16 = (sum * 10) % 11;
 
-    if rest == 10 {
-        0
-    } else {
-        rest
+    match rest {
+        10 => 0,
+        _ => rest,
     }
 }