diff --git a/modules/gltf/SCsub b/modules/gltf/SCsub
index 71f3ba58d9d..5f111165fd0 100644
--- a/modules/gltf/SCsub
+++ b/modules/gltf/SCsub
@@ -7,7 +7,7 @@ env_gltf = env_modules.Clone()
 
 # Godot source files
 env_gltf.add_source_files(env.modules_sources, "*.cpp")
-env_gltf.add_source_files(env.modules_sources, "extensions/*.cpp")
 env_gltf.add_source_files(env.modules_sources, "structures/*.cpp")
+SConscript("extensions/SCsub")
 if env["tools"]:
     env_gltf.add_source_files(env.modules_sources, "editor/*.cpp")
diff --git a/modules/gltf/doc_classes/GLTFDocumentExtension.xml b/modules/gltf/doc_classes/GLTFDocumentExtension.xml
index d2a90224451..205f6c0f8f6 100644
--- a/modules/gltf/doc_classes/GLTFDocumentExtension.xml
+++ b/modules/gltf/doc_classes/GLTFDocumentExtension.xml
@@ -1,8 +1,10 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="GLTFDocumentExtension" inherits="Resource" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
 	<brief_description>
+		[GLTFDocument] extension class.
 	</brief_description>
 	<description>
+		Extends the functionality of the [GLTFDocument] class by allowing you to run arbitrary code at various stages of GLTF import or export.
 	</description>
 	<tutorials>
 	</tutorials>
diff --git a/modules/gltf/doc_classes/GLTFNode.xml b/modules/gltf/doc_classes/GLTFNode.xml
index e933e6046ad..4d1aa89ac94 100644
--- a/modules/gltf/doc_classes/GLTFNode.xml
+++ b/modules/gltf/doc_classes/GLTFNode.xml
@@ -1,10 +1,13 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="GLTFNode" inherits="Resource" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
 	<brief_description>
+		GLTF node class.
 	</brief_description>
 	<description>
+		Represents a GLTF node. GLTF nodes may have names, transforms, children (other GLTF nodes), and more specialized properties (represented by their own classes).
 	</description>
 	<tutorials>
+		<link title="GLTF scene and node spec">https://github.com/KhronosGroup/glTF-Tutorials/blob/master/gltfTutorial/gltfTutorial_004_ScenesNodes.md"</link>
 	</tutorials>
 	<members>
 		<member name="camera" type="int" setter="set_camera" getter="get_camera" default="-1">
diff --git a/modules/gltf/extensions/SCsub b/modules/gltf/extensions/SCsub
new file mode 100644
index 00000000000..ad214bb79c8
--- /dev/null
+++ b/modules/gltf/extensions/SCsub
@@ -0,0 +1,9 @@
+#!/usr/bin/env python
+
+Import("env")
+Import("env_modules")
+
+env_gltf = env_modules.Clone()
+
+# Godot source files
+env_gltf.add_source_files(env.modules_sources, "*.cpp")
diff --git a/modules/gltf/gltf_defines.h b/modules/gltf/gltf_defines.h
index c20c87f7983..9ee23979683 100644
--- a/modules/gltf/gltf_defines.h
+++ b/modules/gltf/gltf_defines.h
@@ -66,9 +66,9 @@ using GLTFBufferIndex = int;
 using GLTFBufferViewIndex = int;
 using GLTFCameraIndex = int;
 using GLTFImageIndex = int;
+using GLTFLightIndex = int;
 using GLTFMaterialIndex = int;
 using GLTFMeshIndex = int;
-using GLTFLightIndex = int;
 using GLTFNodeIndex = int;
 using GLTFSkeletonIndex = int;
 using GLTFSkinIndex = int;
diff --git a/modules/gltf/gltf_document.cpp b/modules/gltf/gltf_document.cpp
index f5730e71373..53cf7285f91 100644
--- a/modules/gltf/gltf_document.cpp
+++ b/modules/gltf/gltf_document.cpp
@@ -191,7 +191,7 @@ Error GLTFDocument::_serialize(Ref<GLTFState> state, const String &p_path) {
 		return Error::FAILED;
 	}
 
-	/* STEP SERIALIZE SCENE */
+	/* STEP SERIALIZE LIGHTS */
 	err = _serialize_lights(state);
 	if (err != OK) {
 		return Error::FAILED;
@@ -401,47 +401,47 @@ Error GLTFDocument::_serialize_nodes(Ref<GLTFState> state) {
 	Array nodes;
 	for (int i = 0; i < state->nodes.size(); i++) {
 		Dictionary node;
-		Ref<GLTFNode> n = state->nodes[i];
+		Ref<GLTFNode> gltf_node = state->nodes[i];
 		Dictionary extensions;
 		node["extensions"] = extensions;
-		if (!n->get_name().is_empty()) {
-			node["name"] = n->get_name();
+		if (!gltf_node->get_name().is_empty()) {
+			node["name"] = gltf_node->get_name();
 		}
-		if (n->camera != -1) {
-			node["camera"] = n->camera;
+		if (gltf_node->camera != -1) {
+			node["camera"] = gltf_node->camera;
 		}
-		if (n->light != -1) {
+		if (gltf_node->light != -1) {
 			Dictionary lights_punctual;
 			extensions["KHR_lights_punctual"] = lights_punctual;
-			lights_punctual["light"] = n->light;
+			lights_punctual["light"] = gltf_node->light;
 		}
-		if (n->mesh != -1) {
-			node["mesh"] = n->mesh;
+		if (gltf_node->mesh != -1) {
+			node["mesh"] = gltf_node->mesh;
 		}
-		if (n->skin != -1) {
-			node["skin"] = n->skin;
+		if (gltf_node->skin != -1) {
+			node["skin"] = gltf_node->skin;
 		}
-		if (n->skeleton != -1 && n->skin < 0) {
+		if (gltf_node->skeleton != -1 && gltf_node->skin < 0) {
 		}
-		if (n->xform != Transform3D()) {
-			node["matrix"] = _xform_to_array(n->xform);
+		if (gltf_node->xform != Transform3D()) {
+			node["matrix"] = _xform_to_array(gltf_node->xform);
 		}
 
-		if (!n->rotation.is_equal_approx(Quaternion())) {
-			node["rotation"] = _quaternion_to_array(n->rotation);
+		if (!gltf_node->rotation.is_equal_approx(Quaternion())) {
+			node["rotation"] = _quaternion_to_array(gltf_node->rotation);
 		}
 
-		if (!n->scale.is_equal_approx(Vector3(1.0f, 1.0f, 1.0f))) {
-			node["scale"] = _vec3_to_arr(n->scale);
+		if (!gltf_node->scale.is_equal_approx(Vector3(1.0f, 1.0f, 1.0f))) {
+			node["scale"] = _vec3_to_arr(gltf_node->scale);
 		}
 
-		if (!n->position.is_zero_approx()) {
-			node["translation"] = _vec3_to_arr(n->position);
+		if (!gltf_node->position.is_zero_approx()) {
+			node["translation"] = _vec3_to_arr(gltf_node->position);
 		}
-		if (n->children.size()) {
+		if (gltf_node->children.size()) {
 			Array children;
-			for (int j = 0; j < n->children.size(); j++) {
-				children.push_back(n->children[j]);
+			for (int j = 0; j < gltf_node->children.size(); j++) {
+				children.push_back(gltf_node->children[j]);
 			}
 			node["children"] = children;
 		}
@@ -450,7 +450,7 @@ Error GLTFDocument::_serialize_nodes(Ref<GLTFState> state) {
 			Ref<GLTFDocumentExtension> ext = document_extensions[ext_i];
 			ERR_CONTINUE(ext.is_null());
 			ERR_CONTINUE(!state->scene_nodes.find(i));
-			Error err = ext->export_node(state, n, state->json, state->scene_nodes[i]);
+			Error err = ext->export_node(state, gltf_node, node, state->scene_nodes[i]);
 			ERR_CONTINUE(err != OK);
 		}
 
@@ -5046,7 +5046,7 @@ ImporterMeshInstance3D *GLTFDocument::_generate_mesh_instance(Ref<GLTFState> sta
 	return mi;
 }
 
-Node3D *GLTFDocument::_generate_light(Ref<GLTFState> state, const GLTFNodeIndex node_index) {
+Light3D *GLTFDocument::_generate_light(Ref<GLTFState> state, const GLTFNodeIndex node_index) {
 	Ref<GLTFNode> gltf_node = state->nodes[node_index];
 
 	ERR_FAIL_INDEX_V(gltf_node->light, state->lights.size(), nullptr);
@@ -5102,6 +5102,7 @@ Node3D *GLTFDocument::_generate_spatial(Ref<GLTFState> state, const GLTFNodeInde
 
 	return spatial;
 }
+
 void GLTFDocument::_convert_scene_node(Ref<GLTFState> state, Node *p_current, const GLTFNodeIndex p_gltf_parent, const GLTFNodeIndex p_gltf_root) {
 	bool retflag = true;
 	_check_visibility(p_current, retflag);
diff --git a/modules/gltf/gltf_document.h b/modules/gltf/gltf_document.h
index 36a2f94a4e2..b3ed786a39e 100644
--- a/modules/gltf/gltf_document.h
+++ b/modules/gltf/gltf_document.h
@@ -188,7 +188,7 @@ private:
 			const GLTFNodeIndex bone_index);
 	ImporterMeshInstance3D *_generate_mesh_instance(Ref<GLTFState> state, const GLTFNodeIndex node_index);
 	Camera3D *_generate_camera(Ref<GLTFState> state, const GLTFNodeIndex node_index);
-	Node3D *_generate_light(Ref<GLTFState> state, const GLTFNodeIndex node_index);
+	Light3D *_generate_light(Ref<GLTFState> state, const GLTFNodeIndex node_index);
 	Node3D *_generate_spatial(Ref<GLTFState> state, const GLTFNodeIndex node_index);
 	void _assign_scene_names(Ref<GLTFState> state);
 	template <class T>