Merge remote-tracking branch 'origin/master'

README.md

@@ -19,6 +19,7 @@ Please use the [Kryo mailing list](https://groups.google.com/forum/#!forum/kryo-
    * [With Maven](#with-maven)
    * [Without Maven](#without-maven)
    * [On Android](#on-android)
+   * [Building from source](#building-from-source)
 - [Quickstart](#quickstart)
 - [IO](#io)
    * [Output](#output)
@@ -160,6 +161,14 @@ implementation ('com.esotericsoftware:kryo:5.0.4') {
 implementation 'org.objenesis:objenesis:2.6'
 ```
 
+### Building from source
+
+Building Kryo from source requires JDK11+ and Maven. To build all artifacts, run:
+
+```
+mvn clean && mvn install
+```
+
 ## Quickstart
 
 Jumping ahead to show how the library can be used: