diff --git a/libuavcan/include/uavcan/protocol/node_status_monitor.hpp b/libuavcan/include/uavcan/protocol/node_status_monitor.hpp
index 84f86f15e4..1c499014ee 100644
--- a/libuavcan/include/uavcan/protocol/node_status_monitor.hpp
+++ b/libuavcan/include/uavcan/protocol/node_status_monitor.hpp
@@ -117,6 +117,7 @@ public:
     /**
      * This helper method allows to quickly estimate the overall network health.
      * Status of the local node is not considered.
+     * Returns an invalid Node ID value if there's no known nodes in the network.
      */
     NodeID findNodeWithWorstStatus() const;
 };