README.md in ocr-file-0.0.7 vs README.md in ocr-file-0.0.8

@@ -77,12 +77,12 @@
 
   doc.to_pdf
 
   # How to merge files into a single PDF:
   # The files can be images or other PDFs
-  filepaths = []
-  documents = file_paths.map { |path| OcrFile::ImageEngines::PdfEngine.open_pdf(path, password: '') }
-  merged_document = OcrFile::ImageEngines::PdfEngine.merge(documents)
+  file_paths = []
+  merged_document = ::HexaPDF::Document.new
+  documents = file_paths.map { |path| OcrFile::ImageEngines::PdfEngine.insert_image(merged_document, path) }
   OcrFile::ImageEngines::PdfEngine.save_pdf(merged_document, save_file_path, optimise: true)
 ```
 
 ### Notes / Tips
 Set `extract_pdf_images` to `false` for higher quality OCR. However this will consume more temporary space per PDF page and also be considerably slower.