diff --git a/meshtastic/mesh_interface.py b/meshtastic/mesh_interface.py
index 3948089..36c7ee8 100644
--- a/meshtastic/mesh_interface.py
+++ b/meshtastic/mesh_interface.py
@@ -813,6 +813,7 @@ class MeshInterface:  # pylint: disable=R0902
         )
 
     def sendHeartbeat(self):
+        """Sends a heartbeat to the radio. Can be used to verify the connection is healthy."""
         p = mesh_pb2.ToRadio()
         p.heartbeat.CopyFrom(mesh_pb2.Heartbeat())
         self._sendToRadio(p)