diff --git a/api-reference/openapi/accounts.json b/api-reference/openapi/accounts.json
index f899c75e..79d11d3f 100644
--- a/api-reference/openapi/accounts.json
+++ b/api-reference/openapi/accounts.json
@@ -2794,10 +2794,6 @@
       },
       "SendEmailRequest": {
         "type": "object",
-        "required": [
-          "to",
-          "subject"
-        ],
         "properties": {
           "to": {
             "type": "array",
@@ -2806,7 +2802,7 @@
               "type": "string",
               "format": "email"
             },
-            "description": "Recipient email address(es). Without a payment method on file, restricted to the account's own email; [add a payment method](/api-reference/credits/sessions-create) to send to any recipient.",
+            "description": "Recipient email address(es). Optional — when omitted, the email is sent to the authenticated account's own email address. Without a payment method on file, restricted to the account's own email; [add a payment method](/api-reference/credits/sessions-create) to send to any recipient.",
             "example": [
               "recipient@example.com"
             ]
@@ -2824,7 +2820,7 @@
           },
           "subject": {
             "type": "string",
-            "description": "Email subject line",
+            "description": "Email subject line. Optional — when omitted, defaults to the first heading or line of the body, falling back to `Message from Recoup` if the body is empty.",
             "example": "Weekly Pulse Report"
           },
           "text": {