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-rw-r--r--ext/socket/option.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/socket/option.c b/ext/socket/option.c
index 4c75fe046d..bf3af171a2 100644
--- a/ext/socket/option.c
+++ b/ext/socket/option.c
@@ -272,6 +272,8 @@ sockopt_int(VALUE self)
* Creates a new Socket::Option object which contains boolean as data.
* Actually 0 or 1 as int is used.
*
+ * require 'socket'
+ *
* p Socket::Option.bool(:INET, :SOCKET, :KEEPALIVE, true)
* #=> #<Socket::Option: INET SOCKET KEEPALIVE 1>
*