diff --git a/src/net.h b/src/net.h
index 218dd67ba6..31f446cde9 100644
--- a/src/net.h
+++ b/src/net.h
@@ -733,6 +733,7 @@ public:
         int64_t nextSendTimeFeeFilter{0};
     };
 
+    // m_tx_relay == nullptr if we're not relaying transactions with this peer
     std::unique_ptr<TxRelay> m_tx_relay;
     // Used for headers announcements - unfiltered blocks to relay
     std::vector<uint256> vBlockHashesToAnnounce GUARDED_BY(cs_inventory);