*
* @param mesh A handle which represents an instance of MeshLink.
* @param channel A handle for the channel.
- * @param len The maximum amount of data that is guaranteed to be accepted by meshlink_channel_send().
+ * @param len The maximum amount of data that is guaranteed to be accepted by meshlink_channel_send(),
+ * or 0 in case of an error.
*/
typedef void (*meshlink_channel_poll_cb_t)(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t len);