diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7dc2565c141..bd87e2d05ba 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -356,6 +356,7 @@ The Coreutils have different implementations, with different levels of completio
 * [V lang](https://github.com/vlang/coreutils)
 * [SerenityOS](https://github.com/SerenityOS/serenity/tree/master/Userland/Utilities)
 * [Initial Unix](https://github.com/dspinellis/unix-history-repo)
+* [Perl Power Tools](https://metacpan.org/pod/PerlPowerTools)
 
 However, when reimplementing the tools/options in Rust, don't read their source codes
 when they are using reciprocal licenses (ex: GNU GPL, GNU LGPL, etc).