diff --git a/extract/requirements.txt b/extract/requirements.txt
new file mode 100644
index 0000000..e98b3b8
--- /dev/null
+++ b/extract/requirements.txt
@@ -0,0 +1,4 @@
+pytesseract
+PyMuPDF
+Pillow
+opencv-python
\ No newline at end of file
diff --git a/pdf/NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.pdf b/pdf/NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.pdf
index 95e3307..635bb9c 100644
Binary files a/pdf/NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.pdf and b/pdf/NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.pdf differ