diff --git a/core/tx_pool.go b/core/tx_pool.go
index 9f57e25381..66c1fe99c8 100644
--- a/core/tx_pool.go
+++ b/core/tx_pool.go
@@ -818,7 +818,7 @@ func (pool *TxPool) AddRemotes(txs []*types.Transaction) []error {
 
 // addTx enqueues a single transaction into the pool if it is valid.
 func (pool *TxPool) addTx(tx *types.Transaction, local bool) error {
-	// caching signature check result before holding lock significantly improve concurrency
+	// Cache sender in transaction before obtaining lock (pool.signer is immutable)
 	types.Sender(pool.signer, tx)
 
 	pool.mu.Lock()
@@ -839,11 +839,10 @@ func (pool *TxPool) addTx(tx *types.Transaction, local bool) error {
 
 // addTxs attempts to queue a batch of transactions if they are valid.
 func (pool *TxPool) addTxs(txs []*types.Transaction, local bool) []error {
-	// caching signature check result before holding lock significantly improve concurrency
+	// Cache senders in transactions before obtaining lock (pool.signer is immutable)
 	for _, tx := range txs {
 		types.Sender(pool.signer, tx)
 	}
-
 	pool.mu.Lock()
 	defer pool.mu.Unlock()