diff --git a/setup/env-variables/backend-env-variables.md b/setup/env-variables/backend-env-variables.md
index 38a82281..d720b6fc 100644
--- a/setup/env-variables/backend-env-variables.md
+++ b/setup/env-variables/backend-env-variables.md
@@ -229,6 +229,7 @@ _**Note**_**: Before release 5.1.2, all environment variables of time format sup
 | `MIGRATION_SANITIZE_DUPLICATED_LOG_INDEX_LOGS_CONCURRENCY`   | Number of parallel logs batches processing. Implemented in [#11055](https://github.com/blockscout/blockscout/pull/11055)                                                                                       | <p>Version: v6.9.0+<br>Default: <code>10</code><br>Applications: API, Indexer</p>      |
 | `MIGRATION_REFETCH_CONTRACT_CODES_BATCH_SIZE`                | Number of addresses to process in the batch. Implemented in [#11055](https://github.com/blockscout/blockscout/pull/11055)                                                                                      | <p>Version: v6.9.0+<br>Default: <code>100</code><br>Applications: API, Indexer</p>     |
 | `MIGRATION_REFETCH_CONTRACT_CODES_CONCURRENCY`               | Number of parallel addresses batches processing. Implemented in [#11055](https://github.com/blockscout/blockscout/pull/11055)                                                                                  | <p>Version: v6.9.0+<br>Default: <code>5</code><br>Applications: API, Indexer</p>       |
+| `MIGRATION_HEAVY_INDEX_OPERATIONS_CHECK_INTERVAL`               | Interval between status checks of heavy db operation like index creation or dropping. Implemented in [#11604](https://github.com/blockscout/blockscout/pull/11604)                                                                                  | <p>Version: master<br>Default: <code>10m</code><br>Applications: API, Indexer</p>       |
 
 ## <mark style="background-color:orange;">Exchange Rates</mark>