diff --git a/README.md b/README.md
index 1006528..59e5054 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 ![Cover Image](book/PHP_and_LLMs.png)
 
 See the sample with two complete chapters
-[PHP and LLMs](https://github.com/alnutile/php-llms/blob/main/book/PHP_LLMs_001.pdf)
+[PHP and LLMs](https://github.com/alnutile/php-llms/blob/main/book/php_and_llms.pdf)
 
 
 ## About the Book
diff --git a/book/PHP_LLMs_001.pdf b/book/php_and_llms.pdf
similarity index 88%
rename from book/PHP_LLMs_001.pdf
rename to book/php_and_llms.pdf
index e038100..f87e200 100644
Binary files a/book/PHP_LLMs_001.pdf and b/book/php_and_llms.pdf differ