diff --git a/documentation/en/default-lotus-config.toml b/documentation/en/default-lotus-config.toml
index 3aca81700..fbdbc852c 100644
--- a/documentation/en/default-lotus-config.toml
+++ b/documentation/en/default-lotus-config.toml
@@ -345,6 +345,7 @@
 
 [Fevm]
   # EnableEthHashToFilecoinCidMapping enables storing a mapping of eth transaction hashes to filecoin message Cids
+  # You will not be able to look up ethereum transactions by their hash if this is disabled.
   #
   # type: bool
   # env var: LOTUS_FEVM_ENABLEETHHASHTOFILECOINCIDMAPPING
diff --git a/node/config/doc_gen.go b/node/config/doc_gen.go
index 73471ccc0..c4cf08471 100644
--- a/node/config/doc_gen.go
+++ b/node/config/doc_gen.go
@@ -404,7 +404,8 @@ see https://lotus.filecoin.io/storage-providers/advanced-configurations/market/#
 			Name: "EnableEthHashToFilecoinCidMapping",
 			Type: "bool",
 
-			Comment: `EnableEthHashToFilecoinCidMapping enables storing a mapping of eth transaction hashes to filecoin message Cids`,
+			Comment: `EnableEthHashToFilecoinCidMapping enables storing a mapping of eth transaction hashes to filecoin message Cids
+You will not be able to look up ethereum transactions by their hash if this is disabled.`,
 		},
 		{
 			Name: "EthTxHashMappingLifetimeDays",
diff --git a/node/config/types.go b/node/config/types.go
index 244a13b70..38671929d 100644
--- a/node/config/types.go
+++ b/node/config/types.go
@@ -696,6 +696,7 @@ type ActorEventConfig struct {
 
 type FevmConfig struct {
 	// EnableEthHashToFilecoinCidMapping enables storing a mapping of eth transaction hashes to filecoin message Cids
+	// You will not be able to look up ethereum transactions by their hash if this is disabled.
 	EnableEthHashToFilecoinCidMapping bool
 	// EthTxHashMappingLifetimeDays the transaction hash lookup database will delete mappings that have been stored for more than x days
 	// Set to 0 to keep all mappings