diff --git a/README.md b/README.md
index b3bce05..5a51855 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,9 @@ Please read [CONTRIBUTING](./docs/CONTRIBUTING.md)
 
 ## How to use
 
-Install calibre 5.
+Install calibre **5+** and jhowell's [KFX Input](https://www.mobileread.com/forums/showthread.php?t=291290) plugin for KFX books. Then install WordDumb plugin from calibre "Preference" -> "Plugins" -> "Get new plugins". Add the plugin to "The context menu for the books in the calibre library" in "Preferences" -> "Toolbars & menus".
 
-Add the plugin to "The context menu for the books in the calibre library" in "Preferences" -> "Toolbars & menus". Right click a MOBI or AZW3 format book then click the plugin menu, it will start generating Word Wise file in a few minutes that depends on the book size and your computer speed.
+Right click a **MOBI**, **AZW3** or **KFX** format book then click the plugin menu, it will start generating Word Wise file in a few minutes that depends on the book size and your computer speed.
 
 If your Kindle device is connected, it will send the file to your device.
 
diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md
index 1a263dc..39052b4 100644
--- a/docs/CONTRIBUTING.md
+++ b/docs/CONTRIBUTING.md
@@ -25,7 +25,7 @@ $ zip -r worddumb-vx.x.x.zip *
 
 ## Add more words
 
-Get `cn-kll.en.en.klld` and `LanguageLayer.en.ASIN.kll` from your Kindle device, then:
+Get `cn-kll.en.en.klld` and `LanguageLayer.en.ASIN.kll` from your Kindle device(please read [word\_wise\_db](./word_wise_db.md)), then:
 
 ```
 $ create_ww_sql.py ./path-of-klld ./path-of-kll
@@ -39,4 +39,4 @@ $ create_ww_sql.py ./path-of-klld ./path-of-kll
 
 - Lemmatize words
 
-- Supports kfx
+- Job progress