--- a/README.md	Mon Aug 19 08:35:48 2019 +0200
+++ b/README.md	Mon Aug 19 09:19:46 2019 +0200
@@ -1,17 +1,32 @@
 General information
 ===================
 
-Orthanc is a lightweight, RESTful Vendor Neutral Archive for DICOM.
+Orthanc is a lightweight, RESTful Vendor Neutral Archive for
+DICOM. General information about Orthanc can be found on its
+[official Website](http://www.orthanc-server.com/).
 
-General information about Orthanc can be found on its [official Website](http://www.orthanc-server.com/).
+This repository contains the source code of the
+[Orthanc Book](http://book.orthanc-server.com/), that documents how
+Orthanc can be used. It also contains the source code of the
+documentation of the
+[REST API of Orthanc](http://api.orthanc-server.com/). The continuous
+integration server (CIS) of Orthanc watches this repository, and
+automatically publishes modifications online.
 
-This repository contains the source code of the [Orthanc Book](http://book.orthanc-server.com/), that documents how Orthanc can be used.
+Improvements that should be done in the documentation can be reported
+onto the
+[dedicated issue tracker](https://bitbucket.org/sjodogne/orthanc-book/issues?status=new&status=open).
 
 
+Orthanc Book
+============
+
 Setup
 -----
 
-To build the Orthanc Book from sources, you need to install [Sphinx](http://www.sphinx-doc.org/), the Python Documentation Generator.
+To build the Orthanc Book from sources, you need to install
+[Sphinx](http://www.sphinx-doc.org/), the Python Documentation
+Generator.
 
 
 ### Installing Sphinx under Ubuntu 14.04 LTS ###
@@ -19,8 +34,8 @@
     # sudo pip install sphinx sphinx_bootstrap_theme
 
 
-Generating the documentation
-----------------------------
+Generating the Book
+-------------------
 
 ### Under Linux ###
 
@@ -34,12 +49,49 @@
     # firefox ./build/html/index.html
 
 
-How to contribute
------------------
+Contributing to the Book
+------------------------
 
- * Make sure to understand the [reStructuredText file format](https://en.wikipedia.org/wiki/ReStructuredText).
+ * Make sure to understand the
+   [reStructuredText file format](https://en.wikipedia.org/wiki/ReStructuredText).
  * Fork this repository onto your BitBucket account.
- * Edit the content of the [`./Sphinx/source/` folder](./Sphinx/source/).
- * Generate locally the Orthanc Book (cf. above), and make sure it displays properly on your computer.
- * Submit a [pull request](https://confluence.atlassian.com/bitbucket/create-a-pull-request-945541466.html) for review by the Orthanc project.
- * Once the pull request is reviewed, the continuous integration server of the Orthanc project will automatically publish the new version [online](http://book.orthanc-server.com/).
+ * Edit the content of the
+   [`./Sphinx/source/` folder](./Sphinx/source/).
+ * Generate locally the Orthanc Book (cf. above), and make sure it
+   displays properly on your computer.
+ * Submit a
+   [pull request](https://confluence.atlassian.com/bitbucket/create-a-pull-request-945541466.html)
+   for review by the Orthanc project.
+ * Once the pull request is reviewed and accepted, the continuous
+   integration server of the Orthanc project will automatically
+   publish the new version [online](http://book.orthanc-server.com/).
+
+
+
+REST API of Orthanc
+===================
+
+Setup
+-----
+
+The REST API of Orthanc is documented according to the
+[OpenAPI specification and in the YAML format](https://en.wikipedia.org/wiki/OpenAPI_Specification).
+
+The source code of the OpenAPI documentation can be found in the file
+[./OpenAPI/orthanc-openapi.yaml](./OpenAPI/orthanc-openapi.yaml)
+within this repository.
+
+Contributing to the OpenAPI
+---------------------------
+
+ * Make sure to understand the
+   [OpenAPI YAML format](https://swagger.io/specification/).
+ * Fork this repository onto your BitBucket account.
+ * Edit the content of the
+   [`./OpenAPI/orthanc-openapi.yaml` file](./OpenAPI/orthanc-openapi.yaml).
+ * Submit a
+   [pull request](https://confluence.atlassian.com/bitbucket/create-a-pull-request-945541466.html)
+   for review by the Orthanc project.
+ * Once the pull request is reviewed and accepted, the continuous
+   integration server of the Orthanc project will automatically
+   publish the new version [online](http://api.orthanc-server.com/).