diff --git a/src/PhpWord/Style/Language.php b/src/PhpWord/Style/Language.php
index dd3ed819..18ef8897 100644
--- a/src/PhpWord/Style/Language.php
+++ b/src/PhpWord/Style/Language.php
@@ -71,6 +71,9 @@ final class Language extends AbstractStyle
     const UK_UA = 'uk-UA';
     const UK_UA_ID = 1058;
 
+    const RU_RU = 'ru-RU';
+    const RU_RU_ID = 1049;
+
     /**
      * Language ID, used for RTF document generation
      *