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-rw-r--r--mrbgems/mruby-io/README.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-io/README.md b/mrbgems/mruby-io/README.md
index 0f50e24ec..256fb8195 100644
--- a/mrbgems/mruby-io/README.md
+++ b/mrbgems/mruby-io/README.md
@@ -40,7 +40,7 @@ Add the line below to your `build_config.rb`:
| IO#binmode? | | |
| IO#bytes | | obsolete |
| IO#chars | | obsolete |
-| IO#clone, IO#dup | | |
+| IO#clone, IO#dup | o | |
| IO#close | o | |
| IO#close_on_exec= | o | |
| IO#close_on_exec? | o | |