diff --git a/bin/reth/src/commands/import_op.rs b/bin/reth/src/commands/import_op.rs
index 8ca1baf5b9..5362b45b08 100644
--- a/bin/reth/src/commands/import_op.rs
+++ b/bin/reth/src/commands/import_op.rs
@@ -1,8 +1,9 @@
-//! Command that initializes the node by importing a chain from a file.
+//! Command that initializes the node by importing OP Mainnet chain segment below Bedrock, from a
+//! file.
 
 use crate::{
     args::{
-        utils::{chain_help, genesis_value_parser, SUPPORTED_CHAINS},
+        utils::{genesis_value_parser, SUPPORTED_CHAINS},
         DatabaseArgs,
     },
     commands::import::{build_import_pipeline, load_config},
@@ -20,7 +21,7 @@ use reth_downloaders::file_client::{
 
 use reth_node_core::init::init_genesis;
 
-use reth_primitives::{hex, stage::StageId, ChainSpec, PruneModes, TxHash};
+use reth_primitives::{hex, stage::StageId, PruneModes, TxHash};
 use reth_provider::{ProviderFactory, StageCheckpointReader, StaticFileProviderFactory};
 use reth_static_file::StaticFileProducer;
 use std::{path::PathBuf, sync::Arc};
@@ -44,18 +45,6 @@ pub struct ImportOpCommand {
     #[arg(long, value_name = "DATA_DIR", verbatim_doc_comment, default_value_t)]
     datadir: MaybePlatformPath<DataDirPath>,
 
-    /// The chain this node is running.
-    ///
-    /// Possible values are either a built-in chain or the path to a chain specification file.
-    #[arg(
-        long,
-        value_name = "CHAIN_OR_PATH",
-        long_help = chain_help(),
-        default_value = SUPPORTED_CHAINS[0],
-        value_parser = genesis_value_parser
-    )]
-    chain: Arc<ChainSpec>,
-
     /// Chunk byte length.
     #[arg(long, value_name = "CHUNK_LEN", verbatim_doc_comment)]
     chunk_len: Option<u64>,
@@ -85,8 +74,10 @@ impl ImportOpCommand {
             "Chunking chain import"
         );
 
+        let chain_spec = genesis_value_parser(SUPPORTED_CHAINS[0])?;
+
         // add network name to data dir
-        let data_dir = self.datadir.unwrap_or_chain_default(self.chain.chain);
+        let data_dir = self.datadir.unwrap_or_chain_default(chain_spec.chain);
         let config_path = self.config.clone().unwrap_or_else(|| data_dir.config());
 
         let mut config: Config = load_config(config_path.clone())?;
@@ -101,15 +92,16 @@ impl ImportOpCommand {
 
         info!(target: "reth::cli", path = ?db_path, "Opening database");
         let db = Arc::new(init_db(db_path, self.db.database_args())?);
+
         info!(target: "reth::cli", "Database opened");
         let provider_factory =
-            ProviderFactory::new(db.clone(), self.chain.clone(), data_dir.static_files())?;
+            ProviderFactory::new(db.clone(), chain_spec.clone(), data_dir.static_files())?;
 
-        debug!(target: "reth::cli", chain=%self.chain.chain, genesis=?self.chain.genesis_hash(), "Initializing genesis");
+        debug!(target: "reth::cli", chain=%chain_spec.chain, genesis=?chain_spec.genesis_hash(), "Initializing genesis");
 
         init_genesis(provider_factory.clone())?;
 
-        let consensus = Arc::new(EthBeaconConsensus::new(self.chain.clone()));
+        let consensus = Arc::new(EthBeaconConsensus::new(chain_spec.clone()));
         info!(target: "reth::cli", "Consensus engine initialized");
 
         // open file
@@ -256,21 +248,3 @@ pub fn is_duplicate(tx_hash: TxHash, block_number: u64) -> bool {
     }
     false
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn parse_common_import_command_chain_args() {
-        for chain in SUPPORTED_CHAINS {
-            let args: ImportOpCommand =
-                ImportOpCommand::parse_from(["reth", "--chain", chain, "."]);
-            assert_eq!(
-                Ok(args.chain.chain),
-                chain.parse::<reth_primitives::Chain>(),
-                "failed to parse chain {chain}"
-            );
-        }
-    }
-}
diff --git a/bin/reth/src/commands/import_receipts.rs b/bin/reth/src/commands/import_receipts.rs
index 8e06c3c03c..2686bcf4e5 100644
--- a/bin/reth/src/commands/import_receipts.rs
+++ b/bin/reth/src/commands/import_receipts.rs
@@ -55,7 +55,10 @@ pub struct ImportReceiptsCommand {
     #[command(flatten)]
     db: DatabaseArgs,
 
-    /// The path to a receipts file for import.
+    /// The path to a receipts file for import. File must use `HackReceiptCodec` (used for
+    /// exporting OP chain segment below Bedrock block via testinprod/op-geth).
+    ///
+    /// <https://github.com/testinprod-io/op-geth/pull/1>
     #[arg(value_name = "IMPORT_PATH", verbatim_doc_comment)]
     path: PathBuf,
 }