diff --git a/setup/env-variables/backend-env-variables.md b/setup/env-variables/backend-env-variables.md
index 631bc4c7..e61c445f 100644
--- a/setup/env-variables/backend-env-variables.md
+++ b/setup/env-variables/backend-env-variables.md
@@ -264,6 +264,7 @@ _**Note**_**: Before release 5.1.2, all environment variables of time format sup
 | `MIGRATION_RECOVERY_WETH_TOKEN_TRANSFERS_TIMEOUT`                | Defines the timeout between processing each batch (`batch_size` \* `concurrency`) in the recovery WETH token transfers migration. Follows the [time format](backend-env-variables.md#time-format). Implemented in [#12065](https://github.com/blockscout/blockscout/pull/12065).                                                                                       | <p>Version: v8.0.0+<br>Default: <code>0s</code><br>Applications: Indexer</p>         |
 | `MIGRATION_RECOVERY_WETH_TOKEN_TRANSFERS_BLOCKS_BATCH_SIZE`      | Specifies the block range size selected for the recovery of WETH token transfer migration. Implemented in [#12065](https://github.com/blockscout/blockscout/pull/12065).                                                                                                                                                                                               | <p>Version: v8.0.0+<br>Default: <code>100000</code><br>Applications: Indexer</p>     |
 | `MIGRATION_RECOVERY_WETH_TOKEN_TRANSFERS_HIGH_VERBOSITY`         | If set to `true`, enables high verbosity logging (logs each transaction hash, where missed transfers were restored) during the recovery of WETH token transfer migration. Implemented in [#12065](https://github.com/blockscout/blockscout/pull/12065).                                                                                                                | <p>Version: v8.0.0+<br>Default: <code>true</code><br>Applications: Indexer</p>       |
+| `MIGRATION_MERGE_ADJACENT_MISSING_BLOCK_RANGES_BATCH_SIZE`         | Specifies the missing block range batch size selected for the merge migration. Implemented in [#12778](https://github.com/blockscout/blockscout/pull/12778).                                                                                                                                                                                                           | <p>Version: master<br>Default: <code>100</code><br>Applications: Indexer</p>         |
 
 ## <mark style="background-color:orange;">Market</mark>