diff --git a/README.md b/README.md
index 5b433c277b1e2b9e0634218e6a90df85d9435263..d725b8b6d0fe4cfc8dc6d27a1c9e1021d436988d 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ You might also need to force browser to load fresh content (instead of showing a
 while reloading. Check for your browser.
 
 ## Modifying
-Learn basic html, and get familiar with w3.
+Learn basic html, I like to use [w3schools/html](https://www.w3schools.com/html/default.asp), and some css also covered by [w3schools/css](https://www.w3schools.com/css/default.asp). Get familiar with [w3.css](https://www.w3schools.com/w3css/default.asp).
 
 ## Content
 Some of the helping files are: