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EIPS/eip-7742.md

@@ -81,23 +81,29 @@ Furthermore `get_base_fee_per_blob_gas` as specified by [EIP-4844](./eip-4844.md
 
 
 ```python
+def calc_excess_blob_gas(parent: Header) -> int:
+  parent_target_blob_gas = parent.target_blob_count * GAS_PER_BLOB
+  if parent.excess_blob_gas + parent.blob_gas_used < parent_target_blob_gas:
+    return 0
+  else:
+    return parent.excess_blob_gas + parent.blob_gas_used - parent_target_blob_gas
+
 def get_base_fee_per_blob_gas(header: Header) -> int:
   update_fraction = BLOB_BASE_FEE_UPDATE_FRACTION_PER_TARGET_BLOB * header.target_blob_count
-
   return fake_exponential(
     MIN_BASE_FEE_PER_BLOB_GAS,
     header.excess_blob_gas,
     update_fraction
     )
 ```
 
-Rest the specification of EIP-4844 is not changed
+Rest of the [EIP-4844](./eip-4844.md) specification is not changed
 
 ### Block construction
 
 To kickstart block construction, CL will now provide EL a target and a maximum blob count. These values should be used to ensure the correct number of blobs are included in any constructed payload, and to ensure that the blob base fee accounting is correctly done as specified above.
 
-For a genesis block with no existing parent, the value should be set according to the agreed specification for the target blob count given by that genesis block's protocol rule set.
+For a genesis block with no existing parent, the value should be set according to the agreed specification for the target blob count given by that genesis block's protocol rule set. For the purposes of this EIP, the target blob count at genesis is set equivalent to [EIP-4844](./eip-4844.md)'s `TARGET_BLOB_GAS_PER_BLOCK`.
 
 ## Rationale