diff a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,9 +1,11 @@
 # Welcome to the JDK!
 
-For build instructions, please see either of these files:
+For build instructions, please see the
+[online documentation](https://openjdk.java.net/groups/build/doc/building.html),
+or either of these files:
 
-- [doc/building.html](https://openjdk.java.net/groups/build/doc/building.html) (html version)
+- [doc/building.html](doc/building.html) (html version)
 - [doc/building.md](doc/building.md) (markdown version)
 
 See <https://openjdk.java.net/> for more information about
 the OpenJDK Community and the JDK.