diff --git a/.vale/styles/FreeBSD/OutdatedVersions.yml b/.vale/styles/FreeBSD/OutdatedVersions.yml
new file mode 100644
--- /dev/null
+++ b/.vale/styles/FreeBSD/OutdatedVersions.yml
@@ -0,0 +1,16 @@
+---
+extends: existence
+message: "Remove reference to '%s' version of FreeBSD."
+level: suggestion
+nonword: true
+ignorecase: true
+tokens:
+  - 'releng\/[1-9][0-1]?\.?[0-9]*'
+  - 'releng\/12\.[0-3]'
+  - 'releng\/13\.[0]'
+  - 'stable\/[0-9][0-1]?'
+  - '[0-9][0-1]?-STABLE'
+  - '[0-9][0-3]?\.0-CURRENT'
+  - '[1-9][0-1]?\.[0-9]*-RELEASE'
+  - '12\.[0-3]-RELEASE'
+  - '13\.[0]-RELEASE'