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-rw-r--r--ext/socket/ancdata.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/ext/socket/ancdata.c b/ext/socket/ancdata.c
index 11409aa834b..0d3846056aa 100644
--- a/ext/socket/ancdata.c
+++ b/ext/socket/ancdata.c
@@ -1769,6 +1769,10 @@ rsock_bsock_recvmsg_nonblock(int argc, VALUE *argv, VALUE sock)
/*
* Document-class: ::Socket::AncillaryData
+ *
+ * Socket::AncillaryData represents the ancillary data (control information)
+ * used by sendmsg and recvmsg system call.
+ * It contains socket family, cmsg level, cmsg type and cmsg data.
*/
void
Init_ancdata(void)