diff --git a/Related-Projects.md b/Related-Projects.md
index a6fddda..38f2386 100644
--- a/Related-Projects.md
+++ b/Related-Projects.md
@@ -25,10 +25,12 @@
 * [mruby-gntp](https://github.com/mattn/mruby-gntp) Growl Notification Transfer Protocol by [mattn](https://github.com/mattn)
 * [mruby-process](https://github.com/iij/mruby-process) Process interface (waitpid, pid, kill, fork, ppid) by [iij](https://github.com/iij)
 * [mruby-digest](https://github.com/iij/mruby-digest) MD5, RMD160, SHA1, SHA256, SHA384, SHA512 and HMAC Digests by [iij](https://github.com/iij)
-* [mruby-pack](https://github.com/iij/mruby-pack) Array#pack implementation by [iij](https://github.com/iij)
+* [mruby-pack](https://github.com/iij/mruby-pack) Array#pack and String#unpack implementation by [iij](https://github.com/iij)
 * [mruby-mtest](https://github.com/iij/mruby-mtest) Minimum Test Framework by [iij](https://github.com/iij)
 * [mruby-iconv](https://github.com/mattn/mruby-iconv) libiconv interface by [mattn](https://github.com/mattn)
 * [mruby-sleep](https://github.com/matsumoto-r/mruby-sleep) sleep binding by [matsumoto_r](https://github.com/matsumoto-r)
+* [mruby-env](https://github.com/iij/mruby-env) ENV class implementation by [iij](https://github.com/iij)
+
 
 ## Web Interfaces