diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f1d399b1..4a94b9da 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,6 +1,6 @@
 ### Please read before contributing
 
-1) If you have any questions about SimpleForm, search the [Wiki](https://github.com/plataformatec/simple_form/wiki) or use the [Mailing List](groups.google.com/group/plataformatec-simpleform) or [Stack Overflow](http://stackoverflow.com/questions/tagged/simple_form). Do not post questions here.
+1) If you have any questions about SimpleForm, search the [Wiki](https://github.com/plataformatec/simple_form/wiki) or use the [Mailing List](https://groups.google.com/group/plataformatec-simpleform) or [Stack Overflow](http://stackoverflow.com/questions/tagged/simple_form). Do not post questions here.
 
 2) If you find a security bug, **DO NOT** submit an issue here. Please send an e-mail to [opensource@plataformatec.com.br](mailto:opensource@plataformatec.com.br) instead.