diff --git a/docs/blocks-storage/compactor.md b/docs/blocks-storage/compactor.md
index 374c192bd7..a51f418e97 100644
--- a/docs/blocks-storage/compactor.md
+++ b/docs/blocks-storage/compactor.md
@@ -298,4 +298,8 @@ compactor:
   # When enabled, index verification will ignore out of order label names.
   # CLI flag: -compactor.accept-malformed-index
   [accept_malformed_index: <boolean> | default = false]
+
+  # When enabled, will fetch the list of block ids using bucket index.
+  # CLI flag: -compactor.bucket-index-block-ids-fetcher-enabled
+  [bucket_index_block_ids_fetcher_enabled: <boolean> | default = false]
 ```
diff --git a/docs/configuration/config-file-reference.md b/docs/configuration/config-file-reference.md
index c2c07da5e4..9259e38500 100644
--- a/docs/configuration/config-file-reference.md
+++ b/docs/configuration/config-file-reference.md
@@ -2017,6 +2017,10 @@ sharding_ring:
 # When enabled, index verification will ignore out of order label names.
 # CLI flag: -compactor.accept-malformed-index
 [accept_malformed_index: <boolean> | default = false]
+
+# When enabled, will fetch the list of block ids using bucket index.
+# CLI flag: -compactor.bucket-index-block-ids-fetcher-enabled
+[bucket_index_block_ids_fetcher_enabled: <boolean> | default = false]
 ```
 
 ### `configs_config`