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-rw-r--r--ext/socket/ifaddr.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/socket/ifaddr.c b/ext/socket/ifaddr.c
index ab163dcc8f..3596c40a11 100644
--- a/ext/socket/ifaddr.c
+++ b/ext/socket/ifaddr.c
@@ -177,6 +177,8 @@ ifaddr_ifindex(VALUE self)
* ifaddr.flags => integer
*
* Returns the flags of _ifaddr_.
+ *
+ * The value is bitwise-or of Socket::IFF_* constants such as Socket::IFF_LOOPBACK.
*/
static VALUE