diff --git a/src/api/types.ts b/src/api/types.ts
index 66382fc8f..ea6d27f55 100644
--- a/src/api/types.ts
+++ b/src/api/types.ts
@@ -4689,7 +4689,9 @@ export interface TaskFailure {
 export type TaskId = string
 
 export interface TextEmbedding {
-  model_id: string
+  /** Model ID is required for all dense_vector fields but
+    * may be inferred for semantic_text fields */
+  model_id?: string
   model_text: string
 }