diff --git a/assistant.go b/assistant.go
index 59f7828..bd33583 100644
--- a/assistant.go
+++ b/assistant.go
@@ -22,6 +22,8 @@ type Assistant struct {
 	Model        string          `json:"model"`
 	Instructions *string         `json:"instructions,omitempty"`
 	Tools        []AssistantTool `json:"tools,omitempty"`
+	FileIDs      []string        `json:"file_ids,omitempty"`
+	Metadata     map[string]any  `json:"metadata,omitempty"`
 
 	httpHeader
 }