diff --git a/Source/DataSources/CzmlDataSource.js b/Source/DataSources/CzmlDataSource.js
index 0506084c17a9..44f6d1318731 100644
--- a/Source/DataSources/CzmlDataSource.js
+++ b/Source/DataSources/CzmlDataSource.js
@@ -1771,6 +1771,7 @@ define([
         processPacketData(Boolean, polygon, 'perPositionHeight', polygonData.perPositionHeight, interval, sourceUri, entityCollection);
         processPacketData(Boolean, polygon, 'closeTop', polygonData.closeTop, interval, sourceUri, entityCollection);
         processPacketData(Boolean, polygon, 'closeBottom', polygonData.closeBottom, interval, sourceUri, entityCollection);
+        processPacketData(ArcType, polygon, 'arcType', polygonData.arcType, interval, sourceUri, entityCollection);
         processPacketData(ShadowMode, polygon, 'shadows', polygonData.shadows, interval, sourceUri, entityCollection);
         processPacketData(DistanceDisplayCondition, polygon, 'distanceDisplayCondition', polygonData.distanceDisplayCondition, interval, sourceUri, entityCollection);
         processPacketData(Number, polygon, 'zIndex', polygonData.zIndex, interval, sourceUri, entityCollection);
diff --git a/Specs/Data/CZML/ValidationDocument.czml b/Specs/Data/CZML/ValidationDocument.czml
index 8b959a351d2e..e012e00a4278 100644
--- a/Specs/Data/CZML/ValidationDocument.czml
+++ b/Specs/Data/CZML/ValidationDocument.czml
@@ -449,6 +449,7 @@
       "perPositionHeight":true,
       "closeTop":true,
       "closeBottom":true,
+      "arcType":"GEODESIC",
       "shadows":"CAST_ONLY",
       "distanceDisplayCondition":{
         "distanceDisplayCondition":[
@@ -6281,6 +6282,9 @@
       "closeBottom":{
         "reference":"Constant#polygon.closeBottom"
       },
+      "arcType":{
+        "reference":"Constant#polygon.arcType"
+      },
       "shadows":{
         "reference":"Constant#polygon.shadows"
       },