update readme.md

jay763190097 · Mar 5, 2017 · d558d08 · d558d08
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@@ -6,7 +6,9 @@ A node module to fill out PDF forms (utf8 compatible),It can support Windows、L
 This includes three branches.There are the ways of fill pdf form by fdf file and by xfdf file ,or use itextpdf.jar to fill pdf
 form.
 
-It uses [pdftk](http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/) to fill out PDF forms.
+The first way and second way you need to download [pdftk](http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/)
+they use pdftk to fill out PDF forms.
+The last way can be used directly.
 
 ## Dependencies
 You need to have the ```pdftk``` binary in your PATH.