From 2f28f41005de2fbb69e99439fabec5eb8bce26f0 Mon Sep 17 00:00:00 2001
From: Ben <3126319718@qq.com>
Date: Mon, 24 Jan 2022 16:48:16 +0800
Subject: [PATCH] update rollup function parameter (#243)

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 90c59567..1bcab860 100644
--- a/README.md
+++ b/README.md
@@ -520,11 +520,11 @@ Map(3) {
 
 To convert a Map to an Array, use [Array.from](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from). See [d3.group](#group) for examples.
 
-<a name="rollups" href="#rollups">#</a> d3.<b>rollups</b>(<i>iterable</i>, <i>...keys</i>) · [Source](https://github.com/d3/d3-array/blob/main/src/group.js), [Examples](https://observablehq.com/@d3/d3-group-d3-rollup)
+<a name="rollups" href="#rollups">#</a> d3.<b>rollups</b>(<i>iterable</i>, <i>reduce</i>, <i>...keys</i>) · [Source](https://github.com/d3/d3-array/blob/main/src/group.js), [Examples](https://observablehq.com/@d3/d3-group-d3-rollup)
 
 Equivalent to [rollup](#rollup), but returns nested arrays instead of nested maps.
 
-<a name="flatRollup" href="#flatRollup">#</a> d3.<b>flatRollup</b>(<i>iterable</i>, <i>...keys</i>) · [Source](https://github.com/d3/d3-array/blob/main/src/group.js), [Examples](https://observablehq.com/@d3/d3-flatgroup)
+<a name="flatRollup" href="#flatRollup">#</a> d3.<b>flatRollup</b>(<i>iterable</i>, <i>reduce</i>, <i>...keys</i>) · [Source](https://github.com/d3/d3-array/blob/main/src/group.js), [Examples](https://observablehq.com/@d3/d3-flatgroup)
 
 Equivalent to [rollup](#rollup), but returns a flat array of [*key0*, *key1*, …, *value*] instead of nested maps.