diff --git a/devtools/chain/blockscan-explorer.env b/devtools/chain/blockscan-explorer.env
index c925ee8eb..525fa44d5 100644
--- a/devtools/chain/blockscan-explorer.env
+++ b/devtools/chain/blockscan-explorer.env
@@ -66,9 +66,16 @@ UNCLES_IN_AVERAGE_BLOCK_TIME=false
 DISABLE_WEBAPP=false
 DISABLE_READ_API=false
 DISABLE_WRITE_API=false
+
 DISABLE_INDEXER=false
 INDEXER_DISABLE_PENDING_TRANSACTIONS_FETCHER=true
 INDEXER_DISABLE_INTERNAL_TRANSACTIONS_FETCHER=true
+INDEXER_DISABLE_BLOCK_REWARD_FETCHER=true
+# Batch size for blocks catchup fetcher, defaults to 10
+INDEXER_CATCHUP_BLOCKS_BATCH_SIZE=1
+# Concurrency for blocks catchup fetcher, defaults to 10
+INDEXER_CATCHUP_BLOCKS_CONCURRENCY=2
+
 WOBSERVER_ENABLED=false
 SHOW_ADDRESS_MARKETCAP_PERCENTAGE=true
 CHECKSUM_ADDRESS_HASHES=true
@@ -85,7 +92,6 @@ COIN_BALANCE_HISTORY_DAYS=90
 APPS_MENU=true
 EXTERNAL_APPS=[]
 DISABLE_BRIDGE_MARKET_CAP_UPDATER=true
-INDEXER_DISABLE_BLOCK_REWARD_FETCHER=true
 ENABLE_POS_STAKING_IN_MENU=false
 SHOW_MAINTENANCE_ALERT=false
 MAINTENANCE_ALERT_MESSAGE=