Made "How to contribute" more focused on GitHub.
diff --git a/src/main/docgen/book.xml b/src/main/docgen/book.xml
index 366e34f..d3a1a87 100644
--- a/src/main/docgen/book.xml
+++ b/src/main/docgen/book.xml
@@ -1234,21 +1234,27 @@
<section xml:id="how-to-contribute">
<title>How do I contribute?</title>
- <para>First you should <link linkend="mailing-lists">subscribe to the
- developer mailing list</link> to discuss what you plan to do.</para>
+ <para>Contributions are preferably done with pull requests on GitHub.
+ Be sure that you are working on the correct branch! <link
+ linkend="sourcecode">See the repositories and branches
+ here!</link></para>
- <para>Then, fork the project on Github, and start working on the
- appropriate branch (see <link linkend="sourcecode">the repositories
- and branches here</link>). See the <literal>README</literal> file in
- it for more information about building and IDE setup. When your
- contribution is ready, send a pull request on Github. Then we can
- still iterate over it until it becomes good enough for merging.</para>
+ <para>Note that by sending a pull request you grant the Apache
+ Software Foundation sufficient rights to use and release the submitted
+ work under the Apache license. You grant the same rights (copyright
+ license, patent license, etc.) to the Apache Software Foundation as if
+ you have signed a <link
+ xlink:href="https://www.apache.org/dev/new-committers-guide.html#cla">Contributor
+ License Agreement</link>. For contributions that are judged to be
+ non-trivial, you will be asked to actually signing a Contributor
+ License Agreement.</para>
- <para>Note that you will need an <link
- xlink:href="https://www.apache.org/dev/new-committers-guide.html#cla">Individual
- Contributor License Agreement (ICLA) or Corporate CLA at the Apache
- Software Foundation</link>, or else we can't merge in your
- contribution.</para>
+ <para>For substantial new features or deeper changes, first you should
+ <link linkend="mailing-lists">subscribe to the developer mailing
+ list</link> to discuss your plans.</para>
+
+ <para>See the <literal>README</literal> file in the project root for
+ more information about building and IDE setup.</para>
<para>For more generic guidelines, see <link
xlink:href="https://www.apache.org/foundation/getinvolved.html">how to