diff --git a/docs/reference/esql/esql-limitations.asciidoc b/docs/reference/esql/esql-limitations.asciidoc
index bb45fd055f296..ddf0bf63a7dbd 100644
--- a/docs/reference/esql/esql-limitations.asciidoc
+++ b/docs/reference/esql/esql-limitations.asciidoc
@@ -99,6 +99,9 @@ unless they're <<esql-multi-index-union-types, explicitly converted to a single
 {esql} does not support configurations where the
 <<mapping-source-field,_source field>> is <<disable-source-field,disabled>>.
 
+experimental:[] {esql}'s support for <<synthetic-source,synthetic `_source`>>
+is currently experimental.
+
 [discrete]
 [[esql-limitations-full-text-search]]
 === Full-text search