diff --git a/README.md b/README.md
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@@ -393,7 +393,8 @@ There're also some great commercial libraries, like [amchart](https://www.amchar
 * [timeago.js](https://github.com/hustcc/timeago.js) - Simple library (less then 2kb) used to format date with `*** time ago` statement.
 * [fecha](https://github.com/taylorhakes/fecha) - Lightweight date formatting and parsing (~2KB). Meant to replace parsing and formatting functionality of moment.js.
 * [date-fns](https://github.com/date-fns/date-fns) - Modern JavaScript date utility library.
-* [map-countdown](https://github.com/dawidjaniga/map-countdown) - A browser countdown built on top of the Google Maps
+* [map-countdown](https://github.com/dawidjaniga/map-countdown) - A browser countdown built on top of the Google Maps.
+* [dayjs](https://github.com/iamkun/dayjs) - Day.js 2KB immutable date library alternative to Moment.js with the same modern API.
 
 ## String
 *String Libraries.*