- * If event_name is NULL, the context is applied to all events of the channel.
- * If channel_name is NULL, a lookup of the event's channel is done.
- * If both are NULL, the context is applied to all events of all channels.
+ * If channel_name is NULL, a lookup of the event's channel is done. If both
+ * are NULL, the context is applied to all events of all channels.
+ *
+ * Note that whatever event_name value is, a context can not be added to an
+ * event, so we just ignore it for now.