diff --git a/library/src/layout/table.rs b/library/src/layout/table.rs
index ad6dc6842..5ad3d3afa 100644
--- a/library/src/layout/table.rs
+++ b/library/src/layout/table.rs
@@ -298,6 +298,7 @@ impl LocalName for TableElem {
             Lang::SLOVENIAN => "Tabela",
             Lang::SPANISH => "Tabla",
             Lang::UKRAINIAN => "Таблиця",
+            Lang::VIETNAMESE => "Bảng",
             Lang::ENGLISH | _ => "Table",
         }
     }
diff --git a/library/src/math/mod.rs b/library/src/math/mod.rs
index 3085b1ae0..be5ca12a3 100644
--- a/library/src/math/mod.rs
+++ b/library/src/math/mod.rs
@@ -286,6 +286,7 @@ impl LocalName for EquationElem {
             Lang::SLOVENIAN => "Enačba",
             Lang::SPANISH => "Ecuación",
             Lang::UKRAINIAN => "Рівняння",
+            Lang::VIETNAMESE => "Phương trình",
             Lang::ENGLISH | _ => "Equation",
         }
     }
diff --git a/library/src/meta/bibliography.rs b/library/src/meta/bibliography.rs
index ec6907e33..d82ae0340 100644
--- a/library/src/meta/bibliography.rs
+++ b/library/src/meta/bibliography.rs
@@ -213,6 +213,7 @@ impl LocalName for BibliographyElem {
             Lang::SLOVENIAN => "Literatura",
             Lang::SPANISH => "Bibliografía",
             Lang::UKRAINIAN => "Бібліографія",
+            Lang::VIETNAMESE => "Tài liệu tham khảo",
             Lang::ENGLISH | _ => "Bibliography",
         }
     }
diff --git a/library/src/meta/heading.rs b/library/src/meta/heading.rs
index bddbb8012..84ac46524 100644
--- a/library/src/meta/heading.rs
+++ b/library/src/meta/heading.rs
@@ -241,6 +241,7 @@ impl LocalName for HeadingElem {
             Lang::SLOVENIAN => "Poglavje",
             Lang::SPANISH => "Sección",
             Lang::UKRAINIAN => "Розділ",
+            Lang::VIETNAMESE => "Phần", // TODO: This may be wrong.
             Lang::ENGLISH | _ => "Section",
         }
     }
diff --git a/library/src/meta/outline.rs b/library/src/meta/outline.rs
index b33eaeb8d..d9eb96d3e 100644
--- a/library/src/meta/outline.rs
+++ b/library/src/meta/outline.rs
@@ -264,6 +264,7 @@ impl LocalName for OutlineElem {
             Lang::SLOVENIAN => "Kazalo",
             Lang::SPANISH => "Índice",
             Lang::UKRAINIAN => "Зміст",
+            Lang::VIETNAMESE => "Mục lục",
             Lang::ENGLISH | _ => "Contents",
         }
     }
diff --git a/library/src/text/raw.rs b/library/src/text/raw.rs
index 5af93c0f6..9a67aa7eb 100644
--- a/library/src/text/raw.rs
+++ b/library/src/text/raw.rs
@@ -212,6 +212,7 @@ impl LocalName for RawElem {
             Lang::RUSSIAN => "Листинг",
             Lang::SLOVENIAN => "Program",
             Lang::UKRAINIAN => "Лістинг",
+            Lang::VIETNAMESE => "Chương trình", // TODO: This may be wrong.
             Lang::ENGLISH | _ => "Listing",
         }
     }
diff --git a/library/src/visualize/image.rs b/library/src/visualize/image.rs
index ed50e8829..f15ddfa61 100644
--- a/library/src/visualize/image.rs
+++ b/library/src/visualize/image.rs
@@ -130,6 +130,7 @@ impl LocalName for ImageElem {
             Lang::SLOVENIAN => "Slika",
             Lang::SPANISH => "Figura",
             Lang::UKRAINIAN => "Рисунок",
+            Lang::VIETNAMESE => "Hình",
             Lang::ENGLISH | _ => "Figure",
         }
     }
diff --git a/src/doc.rs b/src/doc.rs
index 2852c68d5..c2ed5b498 100644
--- a/src/doc.rs
+++ b/src/doc.rs
@@ -528,6 +528,7 @@ impl Lang {
     pub const SLOVENIAN: Self = Self(*b"sl ", 2);
     pub const SPANISH: Self = Self(*b"es ", 2);
     pub const UKRAINIAN: Self = Self(*b"ua ", 2);
+    pub const VIETNAMESE: Self = Self(*b"vi ", 2);
 
     /// Return the language code as an all lowercase string slice.
     pub fn as_str(&self) -> &str {