[ruby/irb] Add help about extra doc dir option

https://github.com/ruby/irb/commit/5018f2cb99

1 files changed, 4 insertions, 0 deletions

diff --git a/man/irb.1 b/man/irb.1
index a8a9b60a53..50db899177 100644
--- a/man/irb.1
+++ b/man/irb.1
@@ -105,6 +105,10 @@ Uses singleline editor module.
 Doesn't use singleline editor module.
 .Pp
 .Pp
+.It Fl -extra-doc-dir
+Add an extra doc dir for the doc dialog.
+.Pp
+.Pp
 .It Fl -echo
 Show result (default).
 .Pp