added full aggragated build instructions
diff --git a/README.md b/README.md
index 3da6c52..251ea1b 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
Manifest to fetch every [Apache Maven](https://maven.apache.org) git repositories using [Google repo](https://source.android.com/source/using-repo).
+In addition, an aggregator structure is provided to build everything as one aggregated build.
+
## Bootstrapping Basics
```
@@ -14,6 +16,18 @@
Then simply use the cloned content with normal `git` commands.
+## Building Everything
+
+Once content is cloned with previous instructions, you can build each repository as a separate project.
+
+You can also build absolutely everything in one aggregated run (WARNING: more than 400 modules...):
+
+```
+cd sources
+mvn --fail-at-end -Prun-its verify
+mvn --fail-at-end -Preporting site
+```
+
## Sources Overview
See [Maven Sources Overview](https://maven.apache.org/scm.html) description.
