diff --git a/homeassistant/components/recorder/migration.py b/homeassistant/components/recorder/migration.py
index ccdaf3082e0..cbe0dcd7258 100644
--- a/homeassistant/components/recorder/migration.py
+++ b/homeassistant/components/recorder/migration.py
@@ -1116,6 +1116,10 @@ class _SchemaVersion16Migrator(_SchemaVersionMigrator, target_version=16):
             SupportedDialect.MYSQL,
             SupportedDialect.POSTGRESQL,
         ):
+            # Version 16 changes settings for the foreign key constraint on
+            # states.old_state_id. Dropping the constraint is not really correct
+            # we should have recreated it instead. Recreating the constraint now
+            # happens in the migration to schema version 45.
             _drop_foreign_key_constraints(
                 self.session_maker, self.engine, TABLE_STATES, "old_state_id"
             )