-<td>{{ macros.simple_checkbox_table("condition", todo.conditions, "condition", "condition_candidates") }}</td>
+<td>{{ macros.simple_checkbox_table("condition", todo.conditions, "condition", "condition_candidates", historical=true) }}</td>
+</tr>
+
+<tr>
+<th>blockers</th>
+<td>{{ macros.simple_checkbox_table("blocker", todo.blockers, "condition", "condition_candidates", historical=true) }}</td>