diff --git a/specification/cdn/resource-manager/readme.md b/specification/cdn/resource-manager/readme.md
index 2012bcf2c7e1..ce98f726e5d8 100644
--- a/specification/cdn/resource-manager/readme.md
+++ b/specification/cdn/resource-manager/readme.md
@@ -31,7 +31,16 @@ openapi-type: arm
 tag: package-2021-06
 ```
 
+### Tag: package-2022-05-preview
 
+These settings apply only when `--tag=package-2022-05-preview` is specified on the command line.
+
+```yaml $(tag) == 'package-2022-05-preview'
+input-file:
+  - Microsoft.Cdn/preview/2022-05-01-preview/afdx.json
+  - Microsoft.Cdn/preview/2022-05-01-preview/cdn.json
+  - Microsoft.Cdn/preview/2022-05-01-preview/cdnwebapplicationfirewall.json
+```
 ### Tag: package-2021-06
 
 These settings apply only when `--tag=package-2021-06` is specified on the command line.