diff --git a/docs/centos9/index.md b/docs/centos9/index.md
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+# CentOS Stream 9
+
+## Release status
+
+* CentOS Stream 9 was made available upstream on the 03.12.2021
+* CentOS Stream 9 was made available at CERN on the 09.02.2022 and is currently a supported operating system, until the end of life of the upstream product which will be ~31.12.2026
+
+## How does CERN use CentOS Stream 9?
+
+### System updates
+
+CentOS Stream 9 updates are staged
+
+* A 'production' [repository](http://linuxsoft.cern.ch/cern/centos/s9/) is provided, which most systems will use and is updated once per week (except for critical security vulnerability patches)
+* A 'testing' [repository](http://linuxsoft.cern.ch/cern/centos/s9-testing/) is also provided which is updated daily
+* Snapshots of CentOS repositories are performed daily and can be found at [this URL](http://linuxsoft.cern.ch/cern/centos/s9-snapshots/)
+* The 'cern-yum-tool' is a new package that can be used to easily switch between 'production', 'testing' or 'snapshot' repositories
+* The 'yum-autoupdate' package is provided for automatic (distro-sync) updates (the same as CC7).
+
+### Modified packages
+
+* centos-stream-release:
+    * Yum repositories files changed to use <http://linuxsoft.cern.ch/cern/centos/s9/>
+* centos-gpg-keys:
+    * Added CERN Koji RPM signing keys
+* epel-release:
+    * Yum repositories files changed to use <http://linuxsoft.cern.ch/>
+
+**Note**: Unless otherwise stated above, CentOS Stream 9 packages (rpms) are the very same packages released by the upstream CentOS team.
+
+## Deployment / Howto
+
+Documentation is in the process of being updated. Currently there are not too many major differences between CentOS Stream 9 and CentOS Stream 8, thus the documentation for [CentOS Stream 8](/centos8/docs) may be helpful.
diff --git a/mkdocs.yml b/mkdocs.yml
index 8cc4c8b713d5dbf2f8534e5c194b6f519415189f..45b16c930caa4ff7cbef6f95b339e663a00872ef 100644
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+++ b/mkdocs.yml
@@ -107,6 +107,8 @@ nav:
                 - 'Documentation': centos8/docs/index.md
                 - 'Installation': centos8/docs/install.md
                 - 'CentOS Linux 8 to CentOS Stream 8 migration': /centos8/docs/migration/
+        - 'CentOS Stream 9 (CS9)':
+            - 'CentOS Stream 9': centos9/index.md
     - 'Other Linux products':
         - 'RedHat Enterprise Linux (RHEL)': rhel/index.md
         - 'Scientific Linux CERN (SLC6) - (deprecated)': "https://linux-archive.web.cern.ch/scientific/"