diff --git a/docs/opensearch/rest-api/bulk.md b/docs/opensearch/rest-api/bulk.md
index 097406cf..a76d0055 100644
--- a/docs/opensearch/rest-api/bulk.md
+++ b/docs/opensearch/rest-api/bulk.md
@@ -71,7 +71,7 @@ Optional document\n
 
 The optional JSON document doesn't need to be minified---spaces are fine---but it does need to be on a single line. OpenSearch uses newline characters to parse bulk requests and requires that the request body end with a newline character.
 
-All actions support the same metadata: `_index`, `_id`, and `_require_alias`.
+All actions support the same metadata: `_index`, `_id`, and `_require_alias`. If you don't provide an ID, OpenSearch generates one automatically, which can make it challenging to update the document at a later time.
 
 - Create