diff --git a/core/measurement_methods.mcf b/core/measurement_methods.mcf
index 913370c4c..2bf5d525c 100644
--- a/core/measurement_methods.mcf
+++ b/core/measurement_methods.mcf
@@ -16,6 +16,10 @@ subClassOf: dcs:MeasurementMethodEnum
 description: "Measurement methods used solely for distinguishing observations that come from different sources about the same statistic."
 typeOf: schema:Class
 
+Node: dcid:CDC_PalmerDroughtSeverityIndex
+typeOf: dcs:MeasurementMethodEnum
+name: "CDC_PalmerDroughtSeverityIndex"
+
 Node: dcid:CovidTrackingProject
 name: "CovidTrackingProject"
 typeOf: dcs:StatisticSourceEnum