diff --git a/Command-Line-Usage.md b/Command-Line-Usage.md
index 64a96c0..71f13a7 100644
--- a/Command-Line-Usage.md
+++ b/Command-Line-Usage.md
@@ -1,6 +1,6 @@
 ## [Tesseract 'man' page](https://github.com/tesseract-ocr/tesseract/blob/master/doc/tesseract.1.asc)
 
-This page has not been updated for Tesseract 4.0. 
+This page has not been (fully) updated for Tesseract 4.0. 
 
 ## Tesseract --help
 
@@ -44,6 +44,12 @@ This page has not been updated for Tesseract 4.0.
 
   Use the config variable as part of command `-c tessedit_page_number=0 ` 
 
+## Integrate original image file and detected text into searchable PDF
+   
+   Use the config variable `-c textonly_pdf=1` and Merge your image-only and text-only PDF.
+
+   see https://github.com/tesseract-ocr/tesseract/issues/660#issuecomment-274213632 for details
+
 ## Simplest Invocation to OCR an image
 
     tesseract imagename outputbase