Update README.md

README.md

@@ -7,3 +7,16 @@ Special thanks to Egon Elbre from #performance on Gophers Slack for [two](https:
 [prototypes](https://play.golang.org/p/4iYBO6Cgj8m) of this idea, based
 on Go's `container/heap` package. Egon's prototypes heavily influenced the final
 design of this package.
+
+## Fork Changes
+
+- Add `WithoutGoroutines` option to be able to perform tasks not spawning a new goroutine for each (bi-zone/schedgroup#1)
+- Fix a race condition which led to Group never been notified about task available  (bi-zone/schedgroup#3)
+
+## Fork Usage
+
+As we are not modifying original module name, the only way to use the fork is using `replace` directive:
+
+```shell
+go mod edit -replace github.com/mdlayher/schedgroup=github.com/bi-zone/schedgroup@latest
+```