diff --git a/src/plugin/relativeTime/index.js b/src/plugin/relativeTime/index.js
index 2a68737..10a8f5d 100644
--- a/src/plugin/relativeTime/index.js
+++ b/src/plugin/relativeTime/index.js
@@ -1,6 +1,7 @@
 import * as C from '../../constant'
 
 export default (o, c, d) => {
+  o = o || {}
   const proto = c.prototype
   d.en.relativeTime = {
     future: 'in %s',
@@ -19,7 +20,7 @@ export default (o, c, d) => {
   }
   const fromTo = (input, withoutSuffix, instance, isFrom) => {
     const loc = instance.$locale().relativeTime
-    const T = [
+    const T = o.thresholds || [
       { l: 's', r: 44, d: C.S },
       { l: 'm', r: 89 },
       { l: 'mm', r: 44, d: C.MIN },
@@ -44,10 +45,10 @@ export default (o, c, d) => {
           ? d(input).diff(instance, t.d, true)
           : instance.diff(input, t.d, true)
       }
-      const abs = Math.round(Math.abs(result))
+      const abs = (o.rounding || Math.round)(Math.abs(result))
       isFuture = result > 0
       if (abs <= t.r || !t.r) {
-        if (abs === 1 && i > 0) t = T[i - 1] // 1 minutes -> a minute
+        if (abs <= 1 && i > 0) t = T[i - 1] // 1 minutes -> a minute, 0 seconds -> 0 second
         const format = loc[t.l]
         if (typeof format === 'string') {
           out = format.replace('%d', abs)
diff --git a/test/plugin/relativeTime.test.js b/test/plugin/relativeTime.test.js
index f039ef3..e8a26e0 100644
--- a/test/plugin/relativeTime.test.js
+++ b/test/plugin/relativeTime.test.js
@@ -1,6 +1,7 @@
 import MockDate from 'mockdate'
 import moment from 'moment'
 import dayjs from '../../src'
+import * as C from '../../src/constant'
 import relativeTime from '../../src/plugin/relativeTime'
 import utc from '../../src/plugin/utc'
 import '../../src/locale/ru'
@@ -115,3 +116,24 @@ it('Time from now with UTC', () => {
 
   expect(dutc.fromNow()).toBe(mutc.fromNow())
 })
+
+it('Custom thresholds and rounding support', () => {
+  expect(dayjs().subtract(45, 'm').fromNow()).toBe('an hour ago')
+  dayjs.extend(relativeTime, {
+    rounding: Math.floor,
+    thresholds: [
+      { l: 's', r: 1 },
+      { l: 'm', r: 1 },
+      { l: 'mm', r: 59, d: C.MIN },
+      { l: 'h', r: 1 },
+      { l: 'hh', r: 23, d: C.H },
+      { l: 'd', r: 1 },
+      { l: 'dd', r: 29, d: C.D },
+      { l: 'M', r: 1 },
+      { l: 'MM', r: 11, d: C.M },
+      { l: 'y' },
+      { l: 'yy', d: C.Y }
+    ]
+  })
+  expect(dayjs().subtract(45, 'm').fromNow()).toBe('45 minutes ago')
+})
diff --git a/types/index.d.ts b/types/index.d.ts
index a0f38c8..f971394 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -96,9 +96,9 @@ declare namespace dayjs {
     locale(preset: string | ILocale, object?: Partial<ILocale>): Dayjs
   }
 
-  export type PluginFunc = (option: any, c: typeof Dayjs, d: typeof dayjs) => void
+  export type PluginFunc<T = unknown> = (option: T, c: typeof Dayjs, d: typeof dayjs) => void
 
-  export function extend(plugin: PluginFunc, option?: any): Dayjs
+  export function extend<T = unknown>(plugin: PluginFunc<T>, option?: T): Dayjs
 
   export function locale(preset: string | ILocale, object?: Partial<ILocale>, isLocal?: boolean): string
 
diff --git a/types/plugin/relativeTime.d.ts b/types/plugin/relativeTime.d.ts
index d08121e..444b0c2 100644
--- a/types/plugin/relativeTime.d.ts
+++ b/types/plugin/relativeTime.d.ts
@@ -1,6 +1,17 @@
 import { PluginFunc, ConfigType } from 'dayjs'
 
-declare const plugin: PluginFunc
+declare interface RelativeTimeThreshold {
+  l: string
+  r?: number
+  d?: string
+}
+
+declare interface RelativeTimeOptions {
+  rounding?: (num: number) => number
+  thresholds?: RelativeTimeThreshold[]
+}
+
+declare const plugin: PluginFunc<RelativeTimeOptions>
 export = plugin
 
 declare module 'dayjs' {