diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index fa3c8a7905..859ef931e7 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -3248,7 +3248,7 @@ static struct config_real ConfigureNamesReal[] =
 	},
 
 	{
-		{"vacuum_cleanup_index_scale_factor", PGC_USERSET, AUTOVACUUM,
+		{"vacuum_cleanup_index_scale_factor", PGC_USERSET, CLIENT_CONN_STATEMENT,
 			gettext_noop("Number of tuple inserts prior to index cleanup as a fraction of reltuples."),
 			NULL
 		},
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index f43086f6d0..5269297d74 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -580,6 +580,8 @@
 #xmloption = 'content'
 #gin_fuzzy_search_limit = 0
 #gin_pending_list_limit = 4MB
+#vacuum_cleanup_index_scale_factor = 0.1	# fraction of total number of tuples
+					# before index cleanup, 0 always performs index cleanup
 
 # - Locale and Formatting -