diff --git a/packages/v0-sdk/openapi.json b/packages/v0-sdk/openapi.json
index e15332a..262da5a 100644
--- a/packages/v0-sdk/openapi.json
+++ b/packages/v0-sdk/openapi.json
@@ -45,7 +45,8 @@
                       "type": "object",
                       "properties": {
                         "url": {
-                          "type": "string"
+                          "type": "string",
+                          "description": "The URL or data URI of the file or asset to include with the message."
                         }
                       },
                       "required": ["url"],
@@ -1660,7 +1661,8 @@
                       "type": "object",
                       "properties": {
                         "url": {
-                          "type": "string"
+                          "type": "string",
+                          "description": "The URL or data URI of the file or asset to include with the message."
                         }
                       },
                       "required": ["url"],