diff --git a/mono/README-short.txt b/mono/README-short.txt
index 19bb0ad99d97..8b4e69d86aea 100644
--- a/mono/README-short.txt
+++ b/mono/README-short.txt
@@ -1 +1 @@
-Mono is an open source implementation of Microsoft's .NET Framework
+DEPRECATED; Mono is an open source implementation of Microsoft's .NET Framework
diff --git a/mono/deprecated.md b/mono/deprecated.md
new file mode 100644
index 000000000000..bf91fc036570
--- /dev/null
+++ b/mono/deprecated.md
@@ -0,0 +1 @@
+This image is deprecated due to maintainer inactivity (last updated Jun 2022; [docker-library/official-images#12682](https://github.com/docker-library/official-images/pull/12682)).