diff --git a/test/t/046_hnsw_vacuum_scan.pl b/test/t/046_hnsw_vacuum_scan.pl
index c9b48cd..cfdfa74 100644
--- a/test/t/046_hnsw_vacuum_scan.pl
+++ b/test/t/046_hnsw_vacuum_scan.pl
@@ -22,6 +22,7 @@ $node->safe_psql("postgres",
 $node->safe_psql("postgres", "CREATE INDEX ON tst USING hnsw (v vector_l2_ops);");
 $node->safe_psql("postgres", "DELETE FROM tst");
 
+# Test HNSW_SCAN_LOCK at the beginning of MarkDeleted is effective
 $node->pgbench(
     "--no-vacuum --client=5 --transactions=1000",
     0,
diff --git a/test/t/047_hnsw_vacuum_insert.pl b/test/t/047_hnsw_vacuum_insert.pl
index a67b966..7ec7571 100644
--- a/test/t/047_hnsw_vacuum_insert.pl
+++ b/test/t/047_hnsw_vacuum_insert.pl
@@ -21,6 +21,7 @@ $node->safe_psql("postgres",
 );
 $node->safe_psql("postgres", "CREATE INDEX ON tst USING hnsw (v vector_l2_ops);");
 
+# Test no "hnsw graph not repaired" errors
 $node->pgbench(
     "--no-vacuum --client=5 --transactions=1000",
     0,