diff --git a/README.md b/README.md
index 5b49965..03d0f59 100644
--- a/README.md
+++ b/README.md
@@ -12,9 +12,9 @@ using Kokoro's high-quality speech synthesis.
 
 [Kokoro-82M](https://huggingface.co/hexgrad/Kokoro-82M) is a recently published text-to-speech model with just 82M params and very natural sounding output.
 It's released under Apache licence and it was trained on < 100 hours of audio.
-It currently supports American and British English in a bunch of very good voices.
+It currently supports American and British English in a bunch of very good voices. 
 
-**Future support for French, Korean, Japanese and Mandarin is planned.**
+Future support for French, Korean, Japanese and Mandarin is planned.
 
 On a Google Colab's T4 GPU via Cuda, **it takes about 5 minutes to convert "Animal's Farm" by Orwell** (which is a bout 160,000 characters) to audiobook, at a rate of about 600 characters per second.
 
@@ -23,9 +23,12 @@ On my M2 MacBook Pro, on CPU, it takes about 1 hour, at a rate of about 60 chara
 ## How to install and run
 
 If you have Python 3 on your computer, you can install it with pip.
+You also need `espeak-ng` installed on your machine:
 
 ```bash
 pip install audiblez
+sudo apt install espeak-ng  # on Ubuntu/Debian
+brew install espeak-ng      # on Mac
 ```
 
 Then, to convert an epub file into an audiobook, just run:
diff --git a/audiblez.py b/audiblez.py
index 4463cf6..3a2f7d4 100755
--- a/audiblez.py
+++ b/audiblez.py
@@ -38,14 +38,14 @@ def main(pipeline, file_path, voice, pick_manually, speed):
     meta_title = book.get_metadata('DC', 'title')
     title = meta_title[0][0] if meta_title else ''
     meta_creator = book.get_metadata('DC', 'creator')
-    creator = meta_creator[0][0] if meta_creator else ''
+    by_creator = 'by ' + meta_creator[0][0] if meta_creator else ''
 
     cover_maybe = [c for c in book.get_items() if c.get_type() == ebooklib.ITEM_COVER]
     cover_image = cover_maybe[0].get_content() if cover_maybe else b""
     if cover_maybe:
         print(f'Found cover image {cover_maybe[0].file_name} in {cover_maybe[0].media_type} format')
 
-    intro = f'{title} by {creator}'
+    intro = f'{title} {by_creator}'
     print(intro)
     print('Found Chapters:', [c.get_name() for c in book.get_items() if c.get_type() == ebooklib.ITEM_DOCUMENT])
     if pick_manually:
@@ -95,7 +95,7 @@ def main(pipeline, file_path, voice, pick_manually, speed):
         print('Progress:', f'{progress}%\n')
 
     if has_ffmpeg:
-        create_index_file(title, creator, chapter_mp3_files)
+        create_index_file(title, by_creator, chapter_mp3_files)
         create_m4b(chapter_mp3_files, filename, cover_image)
 
 
diff --git a/test/test_main.py b/test/test_main.py
index 97b4ad0..74db2c6 100644
--- a/test/test_main.py
+++ b/test/test_main.py
@@ -1,3 +1,4 @@
+import os
 import unittest
 from pathlib import Path
 
@@ -11,11 +12,6 @@ class MainTest(unittest.TestCase):
         pipeline = KPipeline(lang_code='a')
         main(pipeline, file_path=file_path, voice='af_sky', pick_manually=False, speed=1, **kwargs)
 
-    # def test_0_txt(self):
-    #     Path('book.m4b').unlink(missing_ok=True)
-    #     self.base(file_path='../txt/book.txt')
-    #     self.assertTrue(Path('book.m4b').exists())
-
     def test_1_mini(self):
         Path('mini.m4b').unlink(missing_ok=True)
         self.base(file_path='../epub/mini.epub')
@@ -26,12 +22,11 @@ class MainTest(unittest.TestCase):
         self.base(file_path='../epub/poe.epub')
         self.assertTrue(Path('poe.m4b').exists())
 
-    # def test_3_gene(self):
-    #     Path('gene.m4b').unlink(missing_ok=True)
-    #     self.base(file_path='../epub/gene.epub')
-    #     self.assertTrue(Path('gene.m4b').exists())
-
     def test_orwell(self):
         Path('orwell.m4b').unlink(missing_ok=True)
+        os.system('rm orwell_chapter_*.wav')
         self.base(file_path='../epub/orwell.epub')
         self.assertTrue(Path('orwell.m4b').exists())
+        for i in range(8):
+            self.assertTrue(Path(f'orwell_chapter_{i}.wav').exists())
+            self.assertTrue(Path(f'orwell_chapter_{i}.wav').stat().st_size > 300 * 1024, 'file should be larger than 300KB, surely failed')