diff --git a/docs/content/development/datasketches-aggregators.md b/docs/content/development/datasketches-aggregators.md
index 689847bca8c..2d3ee22183f 100644
--- a/docs/content/development/datasketches-aggregators.md
+++ b/docs/content/development/datasketches-aggregators.md
@@ -48,7 +48,7 @@ druid.extensions.loadList=["druid-datasketches"]
 {
   "type"  : "thetaSketchEstimate",
   "name": <output name>,
-  "fieldName"  : <the name field value of the thetaSketch aggregator>
+  "field"  : <post aggregator of type fieldAccess that refers to a thetaSketch aggregator or that of type thetaSketchSetOp>
 }
 ```