Merge pull request #154 from common-workflow-language/contributions-please

encourage contributions from readers

Author: mr-c

index.md

@@ -11,7 +11,16 @@ Hello!
 
 This guide will introduce you to writing tool wrappers and workflows using the Common Workflow Language (CWL). This guide describes the stable specification, version 1.0. Updates to the guide for more recent versions are ongoing.
 
-Note: This document is a work in progress. Not all features are covered, yet.
+> ## Contributions and Feedback are Welcome!
+> This document is a work in progress. Not all features are covered, yet.
+> If you find that something is missing from this guide,
+> or if you'd like to provide other feedback,
+> we would be delighted if you would file an Issue on the
+> [project repository for this guide][repo].
+> You can also suggest changes directly
+> by clicking the "Edit on GitHub" button at the top-right
+> of the relevant page.
+{: .callout}
 
 > ## Prerequisites
 >
@@ -22,4 +31,5 @@ Note: This document is a work in progress. Not all features are covered, yet.
 
 [cwl-runners-list]: https://www.commonwl.org/#Implementations
 [cwltool-install]: https://github.com/common-workflow-language/cwltool#install
+[repo]: https://github.com/common-workflow-language/user-guide/issues
 {% include links.md %}