- /** We can't free the clock vector:
- * The reason is as follows:
- * Clock vectors are snapshotting state... when we delete model actions
- * they are at the end of the node list and have invalid old clock vectors...
- * They are already free at that point...
+ /**
+ * We can't free the clock vector:
+ * Clock vectors are snapshotting state. When we delete model actions,
+ * they are at the end of the node list and have invalid old clock
+ * vectors which have already been rolled back to an unallocated state.