diff --git a/doc/well_log_classes.plantuml b/doc/well_log_classes.plantuml
index c6d1128cbe..84351a114f 100644
--- a/doc/well_log_classes.plantuml
+++ b/doc/well_log_classes.plantuml
@@ -21,6 +21,7 @@ RimPlotCurve <|-- RimSummaryCurve
 RimWellLogCurve <|-- RimWellFlowRateCurve
 RimWellLogCurve <|-- RimWellLogExtractionCurve
 RimWellLogCurve <|-- RimWellLogFileCurve
+RimWellLogCurve <|-- RimWellLogRftCurve
 RimWellLogCurve *--> RigWellLogCurveData
 }
 }