diff --git a/plugins/producer_plugin/producer_plugin.cpp b/plugins/producer_plugin/producer_plugin.cpp
index 679a2b82a4..df4ce39ddd 100644
--- a/plugins/producer_plugin/producer_plugin.cpp
+++ b/plugins/producer_plugin/producer_plugin.cpp
@@ -772,6 +772,7 @@ class producer_plugin_impl : public std::enable_shared_from_this<producer_plugin
    }
 
    void restart_speculative_block() {
+      // log message is used by Node.py verifyStartingBlockMessages in distributed-transactions-test.py test
       fc_dlog(_log, "Restarting exhausted speculative block #${n}", ("n", chain_plug->chain().head_block_num() + 1));
       // abort the pending block
       abort_block();
diff --git a/plugins/producer_plugin/test/test_block_timing_util.cpp b/plugins/producer_plugin/test/test_block_timing_util.cpp
index 6ba697ab6d..1c9108710e 100644
--- a/plugins/producer_plugin/test/test_block_timing_util.cpp
+++ b/plugins/producer_plugin/test/test_block_timing_util.cpp
@@ -76,6 +76,7 @@ BOOST_AUTO_TEST_CASE(test_calculate_block_deadline) {
       auto seventh_block_time = eosio::chain::block_timestamp_type(production_round_1st_block_slot + 6);
       fc::mock_time_traits::set_now(seventh_block_time.to_time_point() - fc::milliseconds(500));
 
+      // 7th block where cpu effort is 100ms less per block
       BOOST_CHECK_EQUAL(calculate_producing_block_deadline(cpu_effort, seventh_block_time),
                         seventh_block_time.to_time_point() - fc::milliseconds(700));
 
@@ -83,6 +84,7 @@ BOOST_AUTO_TEST_CASE(test_calculate_block_deadline) {
       fc::mock_time_traits::set_now(seventh_block_time.to_time_point() - fc::milliseconds(100));
       auto eighth_block_time = eosio::chain::block_timestamp_type(production_round_1st_block_slot + 7);
 
+      // 8th block where cpu effort is 100ms less per block
       BOOST_CHECK_EQUAL(calculate_producing_block_deadline(cpu_effort, eighth_block_time),
                         eighth_block_time.to_time_point() - fc::milliseconds(800));
 
@@ -90,6 +92,7 @@ BOOST_AUTO_TEST_CASE(test_calculate_block_deadline) {
       fc::mock_time_traits::set_now(eighth_block_time.to_time_point() - fc::milliseconds(200));
       auto ninth_block_time = eosio::chain::block_timestamp_type(production_round_1st_block_slot + 8);
 
+      // 9th block where cpu effort is 100ms less per block
       BOOST_CHECK_EQUAL(calculate_producing_block_deadline(cpu_effort, ninth_block_time),
                         ninth_block_time.to_time_point() - fc::milliseconds(900));
    }