diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index 53c3f769c0..3c85ac4153 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -1178,10 +1178,11 @@ func (s *BlockChainAPI) Call(ctx context.Context, args TransactionArgs, blockNrO
 	return result.Return(), result.Err
 }
 
-// DoEstimateGas returns the lowest possible gas limit that allows the transaction to run
+// DoEstimateGas returns some gas limit that allows the transaction to run
 // successfully at block `blockNrOrHash`. It returns error if the transaction would revert, or if
 // there are unexpected failures. The gas limit is capped by both `args.Gas` (if non-nil &
 // non-zero) and `gasCap` (if non-zero).
+// The errorRatio specifies how much larger than the minimum necessary gas the result can be.
 func DoEstimateGas(ctx context.Context, b Backend, args TransactionArgs, blockNrOrHash rpc.BlockNumberOrHash, overrides *StateOverride, gasCap uint64, errorRatio float64) (hexutil.Uint64, error) {
 	// Retrieve the base state and mutate it with any overrides
 	state, header, err := b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)