diff --git a/plone/README-short.txt b/plone/README-short.txt
index fb0da8a942ff..10a47515217f 100644
--- a/plone/README-short.txt
+++ b/plone/README-short.txt
@@ -1 +1 @@
-Plone is a free and open source content management system built on top of Zope.
+DEPRECATED; Plone is a free and open source content management system built on top of Zope.
diff --git a/plone/deprecated.md b/plone/deprecated.md
new file mode 100644
index 000000000000..834664531088
--- /dev/null
+++ b/plone/deprecated.md
@@ -0,0 +1,5 @@
+All versions of Plone contained in this repository are no longer supported.
+
+It is strongly recommended to migrate to the latest available Plone version. See https://plone.org/download/release-schedule for details.
+
+For documentation about installing Plone 6 using Docker, see https://6.docs.plone.org/install/containers/index.html