diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 2b1d953ed28..40291d20513 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -221,8 +221,8 @@ public:
                                       node::TxBroadcast broadcast_method,
                                       std::string& err_string) = 0;
 
-    //! Calculate mempool ancestor and descendant counts for the given transaction.
-    virtual void getTransactionAncestry(const Txid& txid, size_t& ancestors, size_t& descendants, size_t* ancestorsize = nullptr, CAmount* ancestorfees = nullptr) = 0;
+    //! Calculate mempool ancestor and cluster counts for the given transaction.
+    virtual void getTransactionAncestry(const Txid& txid, size_t& ancestors, size_t& cluster_count, size_t* ancestorsize = nullptr, CAmount* ancestorfees = nullptr) = 0;
 
     //! For each outpoint, calculate the fee-bumping cost to spend this outpoint at the specified
     //  feerate, including bumping its ancestors. For example, if the target feerate is 10sat/vbyte