diff --git a/Related-Projects.md b/Related-Projects.md
index 78227c8..427583c 100644
--- a/Related-Projects.md
+++ b/Related-Projects.md
@@ -32,6 +32,7 @@
 * [mruby-env](https://github.com/iij/mruby-env) ENV class implementation by [iij](https://github.com/iij)
 * [mruby-msagent](https://github.com/mattn/mruby-msagent) Microsoft Agent by [mattn](https://github.com/mattn)
 * [mruby-cgroup](https://github.com/matsumoto-r/mruby-cgroup) cgroups binding by [matsumoto_r](https://github.com/matsumoto-r)
+* [mruby-core-ext](https://github.com/skandhas/mruby-core-ext) mruby core extensions by [skandhas](https://github.com/skandhas)
 
 ## Web Interfaces