diff --git a/consensus/misc/eip1559.go b/consensus/misc/eip1559.go
index 1021ba9b07ac8..e0216243f0572 100644
--- a/consensus/misc/eip1559.go
+++ b/consensus/misc/eip1559.go
@@ -71,6 +71,7 @@ func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
 
 	if parent.GasUsed > parentGasTarget {
 		// If the parent block used more gas than its target, the baseFee should increase.
+		// max(1, parentBaseFee * gasUsedDelta / parentGasTarget / baseFeeChangeDenominator)
 		num.SetUint64(parent.GasUsed - parentGasTarget)
 		num.Mul(num, parent.BaseFee)
 		num.Div(num, denom.SetUint64(parentGasTarget))
@@ -80,6 +81,7 @@ func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
 		return num.Add(parent.BaseFee, baseFeeDelta)
 	} else {
 		// Otherwise if the parent block used less gas than its target, the baseFee should decrease.
+		// max(0, parentBaseFee * gasUsedDelta / parentGasTarget / baseFeeChangeDenominator)
 		num.SetUint64(parentGasTarget - parent.GasUsed)
 		num.Mul(num, parent.BaseFee)
 		num.Div(num, denom.SetUint64(parentGasTarget))