diff --git a/django/db/backends/oracle/features.py b/django/db/backends/oracle/features.py
index f7937f24e35..b3531a7cc71 100644
--- a/django/db/backends/oracle/features.py
+++ b/django/db/backends/oracle/features.py
@@ -8,6 +8,9 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     # Oracle crashes with "ORA-00932: inconsistent datatypes: expected - got
     # BLOB" when grouping by LOBs (#24096).
     allows_group_by_lob = False
+    # Although GROUP BY select index is supported by Oracle 23c+, it requires
+    # GROUP_BY_POSITION_ENABLED to be enabled to avoid backward compatibility
+    # issues. Introspection of this settings is not straightforward.
     allows_group_by_select_index = False
     interprets_empty_strings_as_nulls = True
     has_select_for_update = True