diff --git a/docs/api/swagger.yaml b/docs/api/swagger.yaml
index 1da03d662..334acb93b 100644
--- a/docs/api/swagger.yaml
+++ b/docs/api/swagger.yaml
@@ -161,6 +161,10 @@ definitions:
         description: |-
           Array of Attachment ids to be attached as media.
           If provided, status becomes optional, and poll cannot be used.
+
+          If the status is being submitted as a form, the key is 'media_ids[]',
+          but if it's json or xml, the key is 'media_ids'.
+
           in: formData
         items:
           type: string
@@ -422,6 +426,10 @@ definitions:
         description: |-
           Array of Attachment ids to be attached as media.
           If provided, status becomes optional, and poll cannot be used.
+
+          If the status is being submitted as a form, the key is 'media_ids[]',
+          but if it's json or xml, the key is 'media_ids'.
+
           in: formData
         items:
           type: string
@@ -3531,6 +3539,9 @@ paths:
       - description: |-
           Array of Attachment ids to be attached as media.
           If provided, status becomes optional, and poll cannot be used.
+
+          If the status is being submitted as a form, the key is 'media_ids[]',
+          but if it's json or xml, the key is 'media_ids'.
         in: formData
         items:
           type: string
diff --git a/internal/api/client/status/statuscreate_test.go b/internal/api/client/status/statuscreate_test.go
index f83ac8e8f..2a1516d9b 100644
--- a/internal/api/client/status/statuscreate_test.go
+++ b/internal/api/client/status/statuscreate_test.go
@@ -313,7 +313,7 @@ func (suite *StatusCreateTestSuite) TestAttachNewMediaSuccess() {
 	ctx.Request.Header.Set("accept", "application/json")
 	ctx.Request.Form = url.Values{
 		"status":    {"here's an image attachment"},
-		"media_ids": {attachment.ID},
+		"media_ids[]": {attachment.ID},
 	}
 	suite.statusModule.StatusCreatePOSTHandler(ctx)
 
diff --git a/internal/api/model/status.go b/internal/api/model/status.go
index 6e25f787a..62efaf434 100644
--- a/internal/api/model/status.go
+++ b/internal/api/model/status.go
@@ -144,8 +144,12 @@ type StatusCreateRequest struct {
 	Status string `form:"status" json:"status" xml:"status"`
 	// Array of Attachment ids to be attached as media.
 	// If provided, status becomes optional, and poll cannot be used.
+	//
+	// If the status is being submitted as a form, the key is 'media_ids[]',
+	// but if it's json or xml, the key is 'media_ids'.
+	//
 	// in: formData
-	MediaIDs []string `form:"media_ids" json:"media_ids" xml:"media_ids"`
+	MediaIDs []string `form:"media_ids[]" json:"media_ids" xml:"media_ids"`
 	// Poll to include with this status.
 	// swagger:ignore
 	Poll *PollRequest `form:"poll" json:"poll" xml:"poll"`