diff --git a/man7/unix.7 b/man7/unix.7
index 23204302f..2c6a0961a 100644
--- a/man7/unix.7
+++ b/man7/unix.7
@@ -382,7 +382,9 @@ The correct syntax is:
 can be:
 .TP
 .B SIOCINQ
-Returns the amount of queued unread data in the receive buffer.
+For
+.B SOCK_STREAM
+socket the function returns the amount of queued unread data in the receive buffer.
 The socket must not be in LISTEN state, otherwise an error
 .RB ( EINVAL )
 is returned.
@@ -402,6 +404,13 @@ defined in
 .\" That number is normally larger than the number of bytes of pending
 .\" output. Since this info is, from userland's point of view, imprecise,
 .\" and it may well change, probably best not to document this now.
+For
+.B SOCK_DGRAM
+socket,
+the returned value is the same as
+for Internet domain datagram socket;
+see
+.BR udp (7).
 .SH ERRORS
 .TP
 .B EADDRINUSE
@@ -621,4 +630,5 @@ see
 .BR cmsg (3),
 .BR capabilities (7),
 .BR credentials (7),
-.BR socket (7)
+.BR socket (7),
+.BR udp (7)