diff --git a/src/factory.ts b/src/factory.ts
index f806f5c..0ee82a1 100644
--- a/src/factory.ts
+++ b/src/factory.ts
@@ -90,7 +90,13 @@ async function getModelContents(model: FactoryOptions["model"]) {
 	return modelContents;
 }
 
-async function getModelFolderContents(model: string) {
+/**
+ * Reads and model contents and creates a splitted
+ * bundles-object.
+ * @param model
+ */
+
+async function getModelFolderContents(model: string): Promise<PartitionedBundle> {
 	const modelPath = path.resolve(model) + (!!model && !path.extname(model) ? ".pass" : "");
 	const modelFilesList = await readDir(modelPath);
 
@@ -147,7 +153,13 @@ async function getModelFolderContents(model: string) {
 	};
 }
 
-function getModelBufferContents(model: BundleUnit) {
+/**
+ * Analyzes the passed buffer model and splits it to
+ * return buffers and localization files buffers.
+ * @param model
+ */
+
+function getModelBufferContents(model: BundleUnit): PartitionedBundle {
 	const bundle = removeHidden(Object.keys(model)).reduce<BundleUnit>((acc, current) => {
 		// Checking if current file is one of the autogenerated ones or if its
 		// content is not available