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-rw-r--r--doc/policy/mempool-replacements.md7
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/policy/mempool-replacements.md b/doc/policy/mempool-replacements.md
index 3e844f8d7b..18f08daf88 100644
--- a/doc/policy/mempool-replacements.md
+++ b/doc/policy/mempool-replacements.md
@@ -51,6 +51,13 @@ other consensus and policy rules, each of the following conditions are met:
significant portions of the node's mempool using replacements with multiple directly conflicting
transactions, each with large descendant sets.
+6. The replacement transaction's feerate is greater than the feerates of all directly conflicting
+ transactions.
+
+ *Rationale*: This rule was originally intended to ensure that the replacement transaction is
+ preferable for block-inclusion, compared to what would be removed from the mempool. This rule
+ predates ancestor feerate-based transaction selection.
+
This set of rules is similar but distinct from BIP125.
## History