Update README.md

README.md

@@ -9,6 +9,11 @@ computer systems.
 Please see the [INSTALL](https://github.com/cfengine/core/blob/master/INSTALL)
 file for prerequisites and build instructions.
 
+## License
+
+As per the [LICENSE](https://github.com/cfengine/core/blob/master/LICENSE) file, CFEngine Community is licensed
+under the Gnu General Public License GPL, version 3.
+
 ## Example Usage
 
 ### Hello World
@@ -32,11 +37,11 @@ The following policy code may be executed with cf-agent (the main CFEngine binar
     $ cf-agent/cf-agent hello.cf
     R: Hello, world
 
-### Contributing
+## Contributing
 
 Please see the [HACKING.md](https://github.com/cfengine/core/blob/master/HACKING.md) file.
 
-### Relationship to CFEngine 2
+## Relationship to CFEngine 2
 
 CFEngine 3 is *not* a drop-in upgrade for CFEngine 2 installations.  It is a
 significantly more powerful version, but it is incompatible with the CFEngine 2