diff --git a/README.md b/README.md
index 19325e9..deecf5e 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# _Underscore
+# \_Underscore
 
 ![License](https://img.shields.io/github/license/rjNemo/underscore?style=for-the-badge)
 [![Go version](https://img.shields.io/github/go-mod/go-version/rjNemo/underscore?style=for-the-badge&logo=go)](https://pkg.go.dev/github.com/rjNemo/underscore)
@@ -7,9 +7,11 @@
 
 ![underscore](https://socialify.git.ci/rjNemo/underscore/image?description=1&font=KoHo&language=1&logo=https%3A%2F%2Fraw.githubusercontent.com%2FrjNemo%2Funderscore%2Fmain%2Fdocs%2Fstatic%2Flogo.png&owner=1&pattern=Floating%20Cogs&stargazers=1&theme=Dark)
 
-`underscore` is a `Go` library providing useful functional programming helpers without extending any built-in objects.
+`underscore` is a `Go` library providing useful functional programming helpers without
+extending any built-in objects.
 
-It is mostly a port from the `underscore.js` library based on generics brought by `Go 1.18`.
+It is mostly a port from the `underscore.js` library based on generics brought by
+`Go 1.18`.
 
 ## Usage
 
@@ -27,31 +29,32 @@ Please check out the [examples](examples) to see how to use the library.
 package main
 
 import (
-	"fmt"
-	u "github.com/rjNemo/underscore"
+ "fmt"
+ u "github.com/rjNemo/underscore"
 )
 
 func main() {
-	numbers := []int{1, 2, 3, 4, 5, 6, 7, 8, 9}
-	// filter even numbers from the slice
-	evens := u.Filter(numbers, func(n int) bool { return n%2 == 0 })
-	// square every number in the slice
-	squares := u.Map(evens, func(n int) int { return n * n })
-	// reduce to the sum
-	res := u.Reduce(squares, func(n, acc int) int { return n + acc }, 0)
+ numbers := []int{1, 2, 3, 4, 5, 6, 7, 8, 9}
+ // filter even numbers from the slice
+ evens := u.Filter(numbers, func(n int) bool { return n%2 == 0 })
+ // square every number in the slice
+ squares := u.Map(evens, func(n int) int { return n * n })
+ // reduce to the sum
+ res := u.Reduce(squares, func(n, acc int) int { return n + acc }, 0)
 
-	fmt.Println(res) // 120
+ fmt.Println(res) // 120
 }
 ```
 
 ## Getting Started
 
-These instructions will get you a copy of the project up and running on your local machine for development and testing
-purposes.
+These instructions will get you a copy of the project up and running on your local
+machine for development and testing purposes.
 
 ### Prerequisites
 
-You need at least `go1.18` for development. The project is shipped with a [Dockerfile](Dockerfile) based on `go1.18`.
+You need at least `go1.18` for development. The project is shipped with a [Dockerfile](Dockerfile)
+based on `go1.18`.
 
 If you prefer local development, navigate to the [official
 download page](https://go.dev/dl/) and install version `1.18` or beyond.
@@ -92,6 +95,7 @@ make test
 - `Each`
 - `Filter`
 - `Flatmap`
+- `GroupBy`
 - `Find`
 - `Map`
 - `Max`
@@ -101,10 +105,11 @@ make test
 
 ### Pipe
 
-Calling `NewPipe` will cause all future method calls to return wrapped values. When you've finished the computation,
-call `Value` to retrieve the final value.
+Calling `NewPipe` will cause all future method calls to return wrapped values. When
+you've finished the computation, call `Value` to retrieve the final value.
 
-Methods not returning a slice such as `Reduce`, `All`, `Any`, will break the `Chain` and return `Value` instantly.
+Methods not returning a slice such as `Reduce`, `All`, `Any`, will break the `Chain`
+and return `Value` instantly.
 
 ## Built With
 
@@ -112,8 +117,8 @@ Methods not returning a slice such as `Reduce`, `All`, `Any`, will break the `Ch
 
 ## Contributing
 
-Please read [CONTRIBUTING.md](CONTRIBUTING.md) for details on our code of conduct, and the process for submitting pull
-requests to us.
+Please read [CONTRIBUTING.md](CONTRIBUTING.md) for details on our code of conduct,
+and the process for submitting pull requests to us.
 
 ## Versioning
 
@@ -124,13 +129,15 @@ the [tags on this repository](https://github.com/rjNemo/underscore/tags).
 
 - **Ruidy** - _Initial work_ - [Ruidy](https://github.com/rjNemo)
 
-See also the list of [contributors](https://github.com/rjNemo/underscore/contributors) who participated in this project.
+See also the list of [contributors](https://github.com/rjNemo/underscore/contributors)
+who participated in this project.
 
 ## License
 
-This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details
+This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md)
+file for details
 
 ## Acknowledgments
 
-This project is largely inspired by [Underscore.js](https://underscorejs.org/#) library. Check out the original project
-if you don't already know it.
+This project is largely inspired by [Underscore.js](https://underscorejs.org/#)
+library. Check out the original project if you don't already know it.