X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/bdb92619b5f6d920119b8c32c3027cf4b751ed16..cd5141d405db649f0b99ca55b46ff68f16dc13b9:/README.md

diff --git a/README.md b/README.md
index 419ca15957..c480ffda4c 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+[comment]: # (Copyright © The Arvados Authors. All rights reserved.)
+[comment]: # ()
+[comment]: # (SPDX-License-Identifier: CC-BY-SA-3.0)
+
 [Arvados](https://arvados.org) is a free software distributed computing platform
 for bioinformatics, data science, and high throughput analysis of massive data
 sets.  Arvados supports a variety of cloud, cluster and HPC environments.
@@ -42,7 +46,7 @@ doc/README.textile for instructions.
 
 ## Community
 
-The [#arvados](irc://irc.oftc.net:6667/#arvados IRC) (Internet Relay Chat)
+The [#arvados](irc://irc.oftc.net:6667/#arvados) IRC (Internet Relay Chat)
 channel at the
 [Open and Free Technology Community (irc.oftc.net)](http://www.oftc.net/oftc/)
 is available for live discussion and support.  You can use a traditional IRC
@@ -54,7 +58,7 @@ is a forum for general discussion, questions, and news about Arvados
 development.  The
 [Arvados developer mailing list](http://lists.arvados.org/mailman/listinfo/arvados-dev)
 is a forum for more technical discussion, intended for developers and
-contributers to Arvados.
+contributors to Arvados.
 
 ## Development
 
@@ -69,6 +73,10 @@ Instructions for setting up a development environment and working on specific
 components can be found on the
 ["Hacking Arvados" page of the Arvados wiki](https://dev.arvados.org/projects/arvados/wiki/Hacking).
 
+## Contributing
+
+When making a pull request, please ensure *every git commit message* includes a one-line [Developer Certificate of Origin](https://dev.arvados.org/projects/arvados/wiki/Developer_Certificate_Of_Origin). If you have already made commits without it, fix them with `git commit --amend` or `git rebase`.
+
 ## Licensing
 
 Arvados is Free Software.  See COPYING for information about Arvados Free