diff --git a/docs/standard/example/publiccode.yml b/docs/standard/example/publiccode.yml
index 0441a28..3618928 100644
--- a/docs/standard/example/publiccode.yml
+++ b/docs/standard/example/publiccode.yml
@@ -3,6 +3,9 @@ publiccodeYmlVersion: "0.4"
 name: Medusa
 applicationSuite: MegaProductivitySuite
 url: "https://example.com/italia/medusa.git"
+components:
+  - "https://example.com/italia/stheno.git"
+  - "https://example.com/italia/euryale.git"
 landingURL: "https://example.com/italia/medusa"
 isBasedOn: "https://github.com/italia/otello.git"
 softwareVersion: "1.0"
diff --git a/docs/standard/schema.core.rst b/docs/standard/schema.core.rst
index a563c36..fa76e7c 100644
--- a/docs/standard/schema.core.rst
+++ b/docs/standard/schema.core.rst
@@ -41,6 +41,8 @@ Key ``applicationSuite``
 
 This key contains the name of the “suite” to which the software belongs.
 
+.. _key-url:
+
 Key ``url``
 ~~~~~~~~~~~
 
@@ -64,6 +66,21 @@ See :ref:`forks-and-variants` for a complete description of what
 is a software variant and how to handle forked software as a parser or
 an author.
 
+Key ``components``
+~~~~~~~~~~~~~~~~~~
+
+-  Type: array of strings (URLs)
+-  Presence: optional
+
+Some software projects are organized in more than one repository.
+In addition to :ref:`key-url`, this key gives you an option to specify
+more than one URL to further repositories, that are essential parts of 
+the software (e.g. one repository for the frontend and another repository
+for the backend).
+
+If you use the key, you need to specify the URL in the same way as 
+is required for the key ``url``. You can specify more than one URL.
+
 Key ``landingURL``
 ~~~~~~~~~~~~~~~~~~