diff --git a/src/eepp/ui/doc/languages/xtend.cpp b/src/eepp/ui/doc/languages/xtend.cpp
new file mode 100644
index 000000000..4d40961e4
--- /dev/null
+++ b/src/eepp/ui/doc/languages/xtend.cpp
@@ -0,0 +1,108 @@
+#include <eepp/ui/doc/languages/xtend.hpp>
+#include <eepp/ui/doc/syntaxdefinitionmanager.hpp>
+
+namespace EE { namespace UI { namespace Doc { namespace Language {
+
+void addXtend() {
+
+	SyntaxDefinitionManager::instance()->add(
+
+		{ "Xtend",
+		  { "%.xtend$" },
+		  {
+			  { { "//.-\n" }, "comment" },
+			  { { "/%*", "%*/" }, "comment" },
+			  { { "\"", "\"", "\\" }, "string" },
+			  { { "'", "'", "\\" }, "string" },
+			  { { "'\\x%x?%x?%x?%x'" }, "string" },
+			  { { "'\\u%x%x%x%x'" }, "string" },
+			  { { "'\\?.'" }, "string" },
+			  { { "-?0x%x+" }, "number" },
+			  { { "-?%d+[%d%.eE]*f?" }, "number" },
+			  { { "-?%.?%d+f?" }, "number" },
+			  { { "[%+%-=/%*%^%%<>!~|&]" }, "operator" },
+			  { { "[%a_][%w_]*%f[(]" }, "function" },
+			  { { "[%a_][%w_]*" }, "symbol" },
+
+		  },
+		  {
+			  { "abstract", "keyword" },
+			  { "annotation", "keyword" },
+			  { "as", "keyword" },
+			  { "case", "keyword" },
+			  { "catch", "keyword" },
+			  { "class", "keyword" },
+			  { "create", "keyword" },
+			  { "def", "keyword" },
+			  { "default", "keyword" },
+			  { "dispatch", "keyword" },
+			  { "do", "keyword" },
+			  { "else", "keyword" },
+			  { "enum", "keyword" },
+			  { "extends", "keyword" },
+			  { "extension", "keyword" },
+			  { "final", "keyword" },
+			  { "finally", "keyword" },
+			  { "for", "keyword" },
+			  { "if", "keyword" },
+			  { "implements", "keyword" },
+			  { "import", "keyword" },
+			  { "interface", "keyword" },
+			  { "instanceof", "keyword" },
+			  { "it", "keyword" },
+			  { "new", "keyword" },
+			  { "override", "keyword" },
+			  { "package", "keyword" },
+			  { "private", "keyword" },
+			  { "protected", "keyword" },
+			  { "public", "keyword" },
+			  { "return", "keyword" },
+			  { "self", "keyword" },
+			  { "static", "keyword" },
+			  { "super", "keyword" },
+			  { "switch", "keyword" },
+			  { "synchronized", "keyword" },
+			  { "this", "keyword" },
+			  { "throw", "keyword" },
+			  { "throws", "keyword" },
+			  { "try", "keyword" },
+			  { "typeof", "keyword" },
+			  { "val", "keyword" },
+			  { "var", "keyword" },
+			  { "while", "keyword" },
+			  { "AFTER", "keyword" },
+			  { "BEFORE", "keyword" },
+			  { "ENDFOR", "keyword" },
+			  { "ENDIF", "keyword" },
+			  { "FOR", "keyword" },
+			  { "IF", "keyword" },
+			  { "SEPARATOR", "keyword" },
+			  { "boolean", "keyword2" },
+			  { "byte", "keyword2" },
+			  { "char", "keyword2" },
+			  { "double", "keyword2" },
+			  { "float", "keyword2" },
+			  { "int", "keyword2" },
+			  { "long", "keyword2" },
+			  { "short", "keyword2" },
+			  { "void", "keyword2" },
+			  { "Boolean", "keyword2" },
+			  { "Byte", "keyword2" },
+			  { "Character", "keyword2" },
+			  { "Double", "keyword2" },
+			  { "Float", "keyword2" },
+			  { "Integer", "keyword2" },
+			  { "Long", "keyword2" },
+			  { "Short", "keyword2" },
+			  { "String", "keyword2" },
+			  { "true", "literal" },
+			  { "false", "literal" },
+			  { "null", "literal" },
+		  },
+		  "//",
+		  {}
+
+		} );
+}
+
+}}}} // namespace EE::UI::Doc::Language
diff --git a/src/eepp/ui/doc/languages/xtend.hpp b/src/eepp/ui/doc/languages/xtend.hpp
new file mode 100644
index 000000000..6d759b3aa
--- /dev/null
+++ b/src/eepp/ui/doc/languages/xtend.hpp
@@ -0,0 +1,10 @@
+#ifndef EE_UI_DOC_Xtend
+#define EE_UI_DOC_Xtend
+
+namespace EE { namespace UI { namespace Doc { namespace Language {
+
+extern void addXtend();
+
+}}}} // namespace EE::UI::Doc::Language
+
+#endif
diff --git a/src/eepp/ui/doc/syntaxdefinitionmanager.cpp b/src/eepp/ui/doc/syntaxdefinitionmanager.cpp
index 56ea5cacf..c65a5f044 100644
--- a/src/eepp/ui/doc/syntaxdefinitionmanager.cpp
+++ b/src/eepp/ui/doc/syntaxdefinitionmanager.cpp
@@ -90,6 +90,7 @@
 #include <eepp/ui/doc/languages/x86assembly.hpp>
 #include <eepp/ui/doc/languages/xit.hpp>
 #include <eepp/ui/doc/languages/xml.hpp>
+#include <eepp/ui/doc/languages/xtend.hpp>
 #include <eepp/ui/doc/languages/yaml.hpp>
 #include <eepp/ui/doc/languages/zig.hpp>
 #include <eepp/ui/doc/syntaxdefinitionmanager.hpp>
@@ -115,7 +116,7 @@ SyntaxDefinitionManager::SyntaxDefinitionManager() {
 	if ( ms_singleton == nullptr )
 		ms_singleton = this;
 
-	mDefinitions.reserve( 95 );
+	mDefinitions.reserve( 96 );
 
 	// Register some languages support.
 	addPlainText();
@@ -205,6 +206,7 @@ SyntaxDefinitionManager::SyntaxDefinitionManager() {
 	addX86Assembly();
 	addXit();
 	addXML();
+	addXtend();
 	addYAML();
 	addZig();
 }