diff --git a/demo/demo.js b/demo/demo.js
index d68d911..1430145 100644
--- a/demo/demo.js
+++ b/demo/demo.js
@@ -112,7 +112,7 @@ async function render(asyncBuffer, metadata, name) {
     compressors,
     file: asyncBuffer,
     rowEnd: 1000,
-    onComplete(/** @type {any[][] | Record<string, any>[]} */ data) {
+    onComplete(/** @type {any[][]} */ data) {
       const ms = performance.now() - startTime
       console.log(`parsed ${name} in ${ms.toFixed(0)} ms`)
       content.appendChild(renderTable(header, data))
diff --git a/src/hyparquet.d.ts b/src/hyparquet.d.ts
index 2ae394c..cc31ebe 100644
--- a/src/hyparquet.d.ts
+++ b/src/hyparquet.d.ts
@@ -116,7 +116,7 @@ export interface ParquetReadOptions {
   rowStart?: number // inclusive
   rowEnd?: number // exclusive
   onChunk?: (chunk: ColumnData) => void // called when a column chunk is parsed. chunks may be outside the requested range.
-  onComplete?: (rows: any[][] | Record<string, any>[]) => void // called when all requested rows and columns are parsed
+  onComplete?: (rows: any[][]) => void // called when all requested rows and columns are parsed
   compressors?: Compressors // custom decompressors
   utf8?: boolean // decode byte arrays as utf8 strings (default true)
 }
diff --git a/src/read.js b/src/read.js
index 166b4d0..81b7308 100644
--- a/src/read.js
+++ b/src/read.js
@@ -27,7 +27,7 @@ import { concat } from './utils.js'
  * @param {number} [options.rowStart] first requested row index (inclusive)
  * @param {number} [options.rowEnd] last requested row index (exclusive)
  * @param {(chunk: ColumnData) => void} [options.onChunk] called when a column chunk is parsed. chunks may include row data outside the requested range.
- * @param {(rows: any[][] | Record<string, any>[]) => void} [options.onComplete] called when all requested rows and columns are parsed
+ * @param {(rows: any[][]) => void} [options.onComplete] called when all requested rows and columns are parsed
  * @param {Compressors} [options.compressors] custom decompressors
  * @returns {Promise<void>} resolves when all requested rows and columns are parsed
  */
@@ -76,7 +76,7 @@ export async function parquetRead(options) {
  * @param {string[]} [options.columns] columns to read, all columns if undefined
  * @param {string} [options.rowFormat] format of each row passed to the onComplete function
  * @param {(chunk: ColumnData) => void} [options.onChunk] called when a column chunk is parsed. chunks may include row data outside the requested range.
- * @param {(rows: any[][] | Record<string, any>[]) => void} [options.onComplete] called when all requested rows and columns are parsed
+ * @param {(rows: any[][]) => void} [options.onComplete] called when all requested rows and columns are parsed
  * @param {Compressors} [options.compressors]
  * @param {RowGroup} rowGroup row group to read
  * @param {number} groupStart row index of the first row in the group