diff --git a/editor/doc_tools.cpp b/editor/doc_tools.cpp
index d3875709ee4..7fce3c45f8f 100644
--- a/editor/doc_tools.cpp
+++ b/editor/doc_tools.cpp
@@ -1602,7 +1602,7 @@ static void _write_method_doc(Ref<FileAccess> f, const String &p_name, Vector<Do
 	}
 }
 
-Error DocTools::save_classes(const String &p_default_path, const HashMap<String, String> &p_class_path, bool p_include_xml_schema) {
+Error DocTools::save_classes(const String &p_default_path, const HashMap<String, String> &p_class_path, bool p_use_relative_schema) {
 	for (KeyValue<String, DocData::ClassDoc> &E : class_list) {
 		DocData::ClassDoc &c = E.value;
 
@@ -1634,15 +1634,17 @@ Error DocTools::save_classes(const String &p_default_path, const HashMap<String,
 		if (!c.keywords.is_empty()) {
 			header += String(" keywords=\"") + c.keywords.xml_escape(true) + "\"";
 		}
-		if (p_include_xml_schema) {
-			// Reference the XML schema so editors can provide error checking.
+		// Reference the XML schema so editors can provide error checking.
+		String schema_path;
+		if (p_use_relative_schema) {
 			// Modules are nested deep, so change the path to reference the same schema everywhere.
-			const String schema_path = save_path.find("modules/") != -1 ? "../../../doc/class.xsd" : "../class.xsd";
-			header += vformat(
-					R"( xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="%s")",
-					schema_path);
+			schema_path = save_path.find("modules/") != -1 ? "../../../doc/class.xsd" : "../class.xsd";
+		} else {
+			schema_path = "https://raw.githubusercontent.com/godotengine/godot/master/doc/class.xsd";
 		}
-		header += ">";
+		header += vformat(
+				R"( xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="%s">)",
+				schema_path);
 		_write_string(f, 0, header);
 
 		_write_string(f, 1, "<brief_description>");
diff --git a/editor/doc_tools.h b/editor/doc_tools.h
index a6910baf282..3be59bf233c 100644
--- a/editor/doc_tools.h
+++ b/editor/doc_tools.h
@@ -52,7 +52,7 @@ public:
 	};
 	void generate(BitField<GenerateFlags> p_flags = {});
 	Error load_classes(const String &p_dir);
-	Error save_classes(const String &p_default_path, const HashMap<String, String> &p_class_path, bool p_include_xml_schema = true);
+	Error save_classes(const String &p_default_path, const HashMap<String, String> &p_class_path, bool p_use_relative_schema = true);
 
 	Error _load(Ref<XMLParser> parser);
 	Error load_compressed(const uint8_t *p_data, int p_compressed_size, int p_uncompressed_size);
diff --git a/main/main.cpp b/main/main.cpp
index 2def90bc1ae..e30584ebb97 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -637,6 +637,7 @@ void Main::print_help(const char *p_binary) {
 #endif // DISABLE_DEPRECATED
 	print_help_option("--doctool [path]", "Dump the engine API reference to the given <path> (defaults to current directory) in XML format, merging if existing files are found.\n", CLI_OPTION_AVAILABILITY_EDITOR);
 	print_help_option("--no-docbase", "Disallow dumping the base types (used with --doctool).\n", CLI_OPTION_AVAILABILITY_EDITOR);
+	print_help_option("--gdextension-docs", "Rather than dumping the engine API, generate API reference from all the GDExtensions loaded in the current project (used with --doctool).\n", CLI_OPTION_AVAILABILITY_EDITOR);
 #ifdef MODULE_GDSCRIPT_ENABLED
 	print_help_option("--gdscript-docs <path>", "Rather than dumping the engine API, generate API reference from the inline documentation in the GDScript files found in <path> (used with --doctool).\n", CLI_OPTION_AVAILABILITY_EDITOR);
 #endif
@@ -3214,6 +3215,9 @@ int Main::start() {
 #ifdef TOOLS_ENABLED
 		} else if (E->get() == "--no-docbase") {
 			gen_flags.set_flag(DocTools::GENERATE_FLAG_SKIP_BASIC_TYPES);
+		} else if (E->get() == "--gdextension-docs") {
+			gen_flags.set_flag(DocTools::GENERATE_FLAG_SKIP_BASIC_TYPES);
+			gen_flags.set_flag(DocTools::GENERATE_FLAG_EXTENSION_CLASSES_ONLY);
 #ifndef DISABLE_DEPRECATED
 		} else if (E->get() == "--convert-3to4") {
 			converting_project = true;
@@ -3340,29 +3344,34 @@ int Main::start() {
 		HashSet<String> checked_paths;
 		print_line("Loading docs...");
 
-		for (int i = 0; i < _doc_data_class_path_count; i++) {
-			// Custom modules are always located by absolute path.
-			String path = _doc_data_class_paths[i].path;
-			if (path.is_relative_path()) {
-				path = doc_tool_path.path_join(path);
-			}
-			String name = _doc_data_class_paths[i].name;
-			doc_data_classes[name] = path;
-			if (!checked_paths.has(path)) {
-				checked_paths.insert(path);
+		const bool gdextension_docs = gen_flags.has_flag(DocTools::GENERATE_FLAG_EXTENSION_CLASSES_ONLY);
 
-				// Create the module documentation directory if it doesn't exist
-				Ref<DirAccess> da = DirAccess::create_for_path(path);
-				err = da->make_dir_recursive(path);
-				ERR_FAIL_COND_V_MSG(err != OK, EXIT_FAILURE, "Error: Can't create directory: " + path + ": " + itos(err));
+		if (!gdextension_docs) {
+			for (int i = 0; i < _doc_data_class_path_count; i++) {
+				// Custom modules are always located by absolute path.
+				String path = _doc_data_class_paths[i].path;
+				if (path.is_relative_path()) {
+					path = doc_tool_path.path_join(path);
+				}
+				String name = _doc_data_class_paths[i].name;
+				doc_data_classes[name] = path;
+				if (!checked_paths.has(path)) {
+					checked_paths.insert(path);
 
-				print_line("Loading docs from: " + path);
-				err = docsrc.load_classes(path);
-				ERR_FAIL_COND_V_MSG(err != OK, EXIT_FAILURE, "Error loading docs from: " + path + ": " + itos(err));
+					// Create the module documentation directory if it doesn't exist
+					Ref<DirAccess> da = DirAccess::create_for_path(path);
+					err = da->make_dir_recursive(path);
+					ERR_FAIL_COND_V_MSG(err != OK, EXIT_FAILURE, "Error: Can't create directory: " + path + ": " + itos(err));
+
+					print_line("Loading docs from: " + path);
+					err = docsrc.load_classes(path);
+					ERR_FAIL_COND_V_MSG(err != OK, EXIT_FAILURE, "Error loading docs from: " + path + ": " + itos(err));
+				}
 			}
 		}
 
-		String index_path = doc_tool_path.path_join("doc/classes");
+		// For GDExtension docs, use a path that is compatible with Godot modules.
+		String index_path = gdextension_docs ? doc_tool_path.path_join("doc_classes") : doc_tool_path.path_join("doc/classes");
 		// Create the main documentation directory if it doesn't exist
 		Ref<DirAccess> da = DirAccess::create_for_path(index_path);
 		err = da->make_dir_recursive(index_path);
@@ -3383,7 +3392,7 @@ int Main::start() {
 		}
 
 		print_line("Generating new docs...");
-		err = doc.save_classes(index_path, doc_data_classes);
+		err = doc.save_classes(index_path, doc_data_classes, !gdextension_docs);
 		ERR_FAIL_COND_V_MSG(err != OK, EXIT_FAILURE, "Error saving new docs:" + itos(err));
 
 		print_line("Deleting docs cache...");