diff --git a/docs/content/ingestion/index.md b/docs/content/ingestion/index.md
index 455c02c9f89..b8fd4ffd1e3 100644
--- a/docs/content/ingestion/index.md
+++ b/docs/content/ingestion/index.md
@@ -146,7 +146,7 @@ This is a special variation of the JSON ParseSpec that lower cases all the colum
 
 | Field | Type | Description | Required |
 |-------|------|-------------|----------|
-| dimensions | JSON String array | The names of the dimensions. | yes |
+| dimensions | JSON String array | The names of the dimensions. If this is an empty array, Druid will treat all columns that are not timestamp or metric columns as dimension columns. | yes |
 | dimensionExclusions | JSON String array | The names of dimensions to exclude from ingestion. | no (default == [] |
 | spatialDimensions | JSON Object array | An array of [spatial dimensions](../development/geo.html) | no (default == [] |