Update README.md

README.md

@@ -4,14 +4,16 @@
 ## About ##
 Scribd-dl helps downloading documents on [scribd.com](https://www.scribd.com/) without membership / sign-in.  
 2 modes are available:  
-- default:          the .pdf file is generated by chromium's print function  
-- image-based       the .pdf file is generated by image snapshots taken for pages  
+- default:
+  - the .pdf file is generated by chromium's print function  
+- image-based:
+  - the .pdf file is generated by image snapshots taken for pages  
 
 It is prefer to use the `default` mode as it gives a better performance in generation time and file size.  
 `image-based` mode is a backup solution in case the `default` mode doesn't work as expected.
 
 Friendly reminder:  
-1. The .pdf generated by `image-based` mode is formed by images, so it does NOT contain any text.  
+1. The .pdf files generated by `image-based` mode is formed by images, so it does **NOT** contain any text.  
 
 ## Development Plan ##
 Scribd obfuscates the .pdf files, the texts copied from the documents will become strange garbled message.