diff --git a/reference/auth/models/palmtreerequest.v1.yaml b/reference/auth/models/palmtreerequest.v1.yaml
index 0722ac63..0091da3a 100644
--- a/reference/auth/models/palmtreerequest.v1.yaml
+++ b/reference/auth/models/palmtreerequest.v1.yaml
@@ -2,4 +2,7 @@ title: Palm Tree Request Data
 description: Data to send to Palm Tree's API.
 type: object
 properties:
-- name: csr
\ No newline at end of file
+  csr:
+    description: Base64 encoded certificate signing request.
+    type: string
+    pattern: '^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$'
\ No newline at end of file