diff --git a/serverlessworkflow/modules/ROOT/pages/data-index/data-index-core-concepts.adoc b/serverlessworkflow/modules/ROOT/pages/data-index/data-index-core-concepts.adoc
index afd69aa36..c756742d2 100644
--- a/serverlessworkflow/modules/ROOT/pages/data-index/data-index-core-concepts.adoc
+++ b/serverlessworkflow/modules/ROOT/pages/data-index/data-index-core-concepts.adoc
@@ -270,6 +270,10 @@ Depending on the attribute type, the following operators are also available:
 ** `between`: Date range
 ** `from`: Date time
 ** `to`: Date time
+
+* Enum argument:
+** `equal`: Enum value
+** `in`: Array of enum values
 --
 
 Sort query results using the `orderBy` parameter::