diff --git a/.hash b/.hash
index f483216..e7052d6 100644
--- a/.hash
+++ b/.hash
@@ -19,4 +19,4 @@ year2/ethics-in-ai/module1,e0ef470
 year2/ethics-in-ai/module2,bc77ff5
 year2/ethics-in-ai/module3,617fd5b
 year2/machine-learning-for-computer-vision,8d57b81
-year2/natural-language-processing,6f03be6
+year2/natural-language-processing,5e29891
diff --git a/README.md b/README.md
index 515a60b..8504da6 100644
--- a/README.md
+++ b/README.md
@@ -43,4 +43,4 @@ Compiled PDF files are in the [`pdfs` branch](https://github.com/NotXia/unibo-ai
 ## Contributors
 Special thanks for the help to:
 
-[![liuktc](https://images.weserv.nl/?url=https://github.com/liuktc.png&h=50&w&50&mask=circle&fit=cover&maxage=1d)](https://github.com/liuktc)
\ No newline at end of file
+[![liuktc](https://images.weserv.nl/?url=https://github.com/liuktc.png&h=50&w&50&mask=circle&fit=cover&maxage=1d)](https://github.com/liuktc)$\hspace{1em}$[![fraktc](https://images.weserv.nl/?url=https://github.com/fraktc.png&h=50&w&50&mask=circle&fit=cover&maxage=1d)](https://github.com/fraktc)
\ No newline at end of file
diff --git a/year2/natural-language-processing/nlp.pdf b/year2/natural-language-processing/nlp.pdf
index 42d329a..c3b070d 100644
Binary files a/year2/natural-language-processing/nlp.pdf and b/year2/natural-language-processing/nlp.pdf differ