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-rw-r--r--man/ruby.14
1 files changed, 4 insertions, 0 deletions
diff --git a/man/ruby.1 b/man/ruby.1
index eddf0e21e8..cedc4e7958 100644
--- a/man/ruby.1
+++ b/man/ruby.1
@@ -517,6 +517,10 @@ enabled for only mswin32, mingw32, and OS/2 platforms. If this
variable is not defined, Ruby refers to
.Ev COMSPEC .
.Pp
+.It Ev RUBY_IO_BUFFER_DEFAULT_SIZE
+The custom default buffer size of
+.Li IO::Buffer .
+.Pp
.It Ev PATH
Ruby refers to the
.Ev PATH