diff --git a/specs/_features/eip7594/das-core.md b/specs/_features/eip7594/das-core.md
index 635fa35f17..4cfa687cc1 100644
--- a/specs/_features/eip7594/das-core.md
+++ b/specs/_features/eip7594/das-core.md
@@ -45,7 +45,6 @@ We define the following Python custom types for type hinting and readability:
 | `DataColumn`   | `List[Cell, MAX_BLOBS_PER_BLOCK]` | The data of each column in EIP7594 |
 | `ExtendedMatrix` | `List[Cell, MAX_BLOBS_PER_BLOCK * NUMBER_OF_COLUMNS]` | The full data with blobs and one-dimensional erasure coding extension |
 | `FlatExtendedMatrix` | `List[BLSFieldElement, MAX_BLOBS_PER_BLOCK * FIELD_ELEMENTS_PER_BLOB * NUMBER_OF_COLUMNS]` | The flattened format of `ExtendedMatrix` |
-| `LineIndex`    | `uint64` | The index of the rows or columns in `FlatExtendedMatrix` matrix |
 
 ## Configuration
 
@@ -68,11 +67,10 @@ We define the following Python custom types for type hinting and readability:
 #### `get_custody_lines`
 
 ```python
-def get_custody_lines(node_id: NodeID, custody_size: uint64) -> Sequence[LineIndex]:
+def get_custody_lines(node_id: NodeID, custody_size: uint64) -> Sequence[ColumnID]:
     assert custody_size <= NUMBER_OF_COLUMNS
-    all_items = list(range(NUMBER_OF_COLUMNS))
-    line_index = node_id % NUMBER_OF_COLUMNS
-    return [LineIndex(all_items[(line_index + i) % len(all_items)]) for i in range(custody_size)]
+    column_index = node_id % NUMBER_OF_COLUMNS
+    return [ColumnID((column_index + i) % NUMBER_OF_COLUMNS) for i in range(custody_size)]
 ```
 
 #### `compute_extended_data`
diff --git a/specs/_features/eip7594/polynomial-commitments-sampling.md b/specs/_features/eip7594/polynomial-commitments-sampling.md
index e09888a31b..9c6777b6a5 100644
--- a/specs/_features/eip7594/polynomial-commitments-sampling.md
+++ b/specs/_features/eip7594/polynomial-commitments-sampling.md
@@ -60,6 +60,8 @@ Public functions MUST accept raw bytes as input and perform the required cryptog
 | `PolynomialCoeff` | `List[BLSFieldElement, 2 * FIELD_ELEMENTS_PER_BLOB]` | A polynomial in coefficient form |
 | `Cell` | `Vector[BLSFieldElement, FIELD_ELEMENTS_PER_CELL]` | The unit of blob data that can come with their own KZG proofs |
 | `CellID` | `uint64` | Cell identifier |
+| `RowID` | `uint64` | Row identifier |
+| `ColumnID` | `uint64` | Column identifier |
 
 ## Constants
 
@@ -415,8 +417,8 @@ def verify_cell_proof(commitment: KZGCommitment,
 
 ```python
 def verify_cell_proof_batch(row_commitments: Sequence[KZGCommitment],
-                            row_ids: Sequence[int],
-                            column_ids: Sequence[int],
+                            row_ids: Sequence[RowID],
+                            column_ids: Sequence[ColumnID],
                             cells: Sequence[Cell],
                             proofs: Sequence[KZGProof]) -> bool:
     """