diff --git a/docs/reference/engine/content/s3.md b/docs/reference/engine/content/s3.md
index 67f889ec..d4b4aa0d 100644
--- a/docs/reference/engine/content/s3.md
+++ b/docs/reference/engine/content/s3.md
@@ -15,7 +15,7 @@ Use GraphQL `generateUploadUrl` mutation to generate a presigned S3 upload URL.
 Execute following mutation in your application:
 ```
 mutation {
-  signedUpload: generateUploadUrl(contentType: "image/jpeg") {
+  signedUpload: generateUploadUrl(input: { contentType: "image/*" })
     url
     publicUrl
     method