diff --git a/doc/contributing.rdoc b/doc/contributing.rdoc
index ebd5904f69..7dcead77f6 100644
--- a/doc/contributing.rdoc
+++ b/doc/contributing.rdoc
@@ -79,7 +79,7 @@ The current active platform maintainers are as follows:
 [Solaris]
   Naohisa Goto (ngoto)
 [RHEL, CentOS]
-  KOSAKI Motohiro kosaki
+  KOSAKI Motohiro (kosaki)
 [macOS]
   Kenta Murata (mrkn)
 [cygwin, bcc32, djgpp, wince, ...]