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-rw-r--r--io.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/io.c b/io.c
index df05436..0a4a58a 100644
--- a/io.c
+++ b/io.c
@@ -282,6 +282,7 @@ rb_io_get_write_io(VALUE io)
* IO.try_convert(STDOUT) # => STDOUT
* IO.try_convert("STDOUT") # => nil
*
+ * require 'zlib'
* f = open("/tmp/zz.gz") # => #<File:/tmp/zz.gz>
* z = Zlib::GzipReader.open(f) # => #<Zlib::GzipReader:0x81d8744>
* IO.try_convert(z) # => #<File:/tmp/zz.gz>