diff --git a/consensus/misc/eip1559.go b/consensus/misc/eip1559.go
index 977538b7e09f4..5de5685dbf8a8 100644
--- a/consensus/misc/eip1559.go
+++ b/consensus/misc/eip1559.go
@@ -69,6 +69,7 @@ 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)
 		r := new(big.Int).SetUint64(parent.GasUsed - parentGasTarget)
 		r.Mul(r, parent.BaseFee)
 		r.Div(r, parentGasTargetAdjusted)
@@ -77,6 +78,7 @@ func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
 		return r
 	} else {
 		// Otherwise if the parent block used less gas than its target, the baseFee should decrease.
+		// max(0, parentBaseFee * gasUsedDelta / parentGasTarget * baseFeeChangeDenominator)
 		r := new(big.Int).SetUint64(parentGasTarget - parent.GasUsed)
 		r.Mul(r, parent.BaseFee)
 		r.Div(r, parentGasTargetAdjusted)