diff --git a/socket/socket_connected.3 b/socket/socket_connected.3
new file mode 100644
index 0000000..8d2684a
--- /dev/null
+++ b/socket/socket_connected.3
@@ -0,0 +1,13 @@
+.TH socket_connected 3
+.SH NAME
+socket_connected \- is a connection established on a socket?
+.SH SYNTAX
+.B #include <socket.h>
+
+int \fBsocket_connected\fP(int \fIs\fR);
+.SH DESCRIPTION
+socket_connected returns 1 if \fIs\fR is a socket and a
+connection is established, 0 otherwise.
+
+.SH "SEE ALSO"
+socket_remote4(3), socket_remote6(3)
diff --git a/socket/socket_getifidx.3 b/socket/socket_getifidx.3
new file mode 100644
index 0000000..d5b615f
--- /dev/null
+++ b/socket/socket_getifidx.3
@@ -0,0 +1,19 @@
+.TH socket_getifidx 3
+.SH NAME
+socket_getifidx \- get interface number
+.SH SYNTAX
+.B #include <socket.h>
+
+int \fBsocket_getifidx\fP(const char* \fIifname\fR);
+.SH DESCRIPTION
+socket_getifidx returns the interface number for a symbolic network
+interface name (like "eth0" on Linux, for example).
+
+The interface number can be used as scope_id for IPv6 communications on
+link-local addresses.
+
+If something goes wrong, socket_getifidx returns -1, setting errno
+appropriately.
+
+.SH "SEE ALSO"
+socket_getifname(3), socket_connect6(3)
diff --git a/socket/socket_getifname.3 b/socket/socket_getifname.3
new file mode 100644
index 0000000..ca315c0
--- /dev/null
+++ b/socket/socket_getifname.3
@@ -0,0 +1,17 @@
+.TH socket_getifname 3
+.SH NAME
+socket_getifname \- get interface name
+.SH SYNTAX
+.B #include <socket.h>
+
+const char* \fBsocket_getifname\fP(uint32 \fIinterface\fR);
+.SH DESCRIPTION
+socket_getifname returns the symbolic interface name for a network
+interface number.  The returned char* is a static buffer in the libc.
+If you query the named for more than one interface, you have to save the
+name before calling \fBsocket_getifidx\fR again.
+
+If something goes wrong, socket_getifname returns "[unknown]".
+
+.SH "SEE ALSO"
+socket_getifidx(3), socket_connect6(3)
diff --git a/socket/socket_mcjoin4.3 b/socket/socket_mcjoin4.3
index 1055426..de30a21 100644
--- a/socket/socket_mcjoin4.3
+++ b/socket/socket_mcjoin4.3
@@ -8,12 +8,7 @@ int \fBsocket_mcjoin4\fP(int \fIs\fR,const char \fIgroupip\fR[4],const char \fIi
 .SH DESCRIPTION
 socket_mcjoin4 joins the IPv4 multicast group \fIgroupip\fR on \fIinterface\fR.
 
-TODO
-
-socket \fIs\fR and writes the IP address to \fIip\fR and the port to
-\fIport\fR.
-
-If something goes wrong, socket_local4 returns -1, setting errno
+If something goes wrong, socket_mcjoin4 returns -1, setting errno
 appropriately.
 .SH "SEE ALSO"
-socket_accept4(3), socket_remote4(3)
+socket_mcleave4(3), socket_mcjoin6(3), socket_getifidx(3)
diff --git a/socket/socket_mcjoin6.3 b/socket/socket_mcjoin6.3
new file mode 100644
index 0000000..f6a5903
--- /dev/null
+++ b/socket/socket_mcjoin6.3
@@ -0,0 +1,14 @@
+.TH socket_mcjoin6 3
+.SH NAME
+socket_mcjoin6 \- join a multicast group
+.SH SYNTAX
+.B #include <socket.h>
+
+int \fBsocket_mcjoin6\fP(int \fIs\fR,const char \fIgroupip\fR[16],uint32 \fIinterface\fR);
+.SH DESCRIPTION
+socket_mcjoin6 joins the IPv6 multicast group \fIgroupip\fR on \fIinterface\fR.
+
+If something goes wrong, socket_mcjoin6 returns -1, setting errno
+appropriately.
+.SH "SEE ALSO"
+socket_mcleave6(3), socket_mcjoin4(3), socket_getifidx(3)
diff --git a/socket/socket_mcleave4.3 b/socket/socket_mcleave4.3
new file mode 100644
index 0000000..46ca9ed
--- /dev/null
+++ b/socket/socket_mcleave4.3
@@ -0,0 +1,14 @@
+.TH socket_mcleave4 3
+.SH NAME
+socket_mcleave4 \- leave a multicast group
+.SH SYNTAX
+.B #include <socket.h>
+
+int \fBsocket_mcleave4\fP(int \fIs\fR, const char \fIgroupip\fR[4], const char \fIinterface\fR[4]);
+.SH DESCRIPTION
+socket_mcleave4 leaves the IPv4 multicast group \fIgroupip\fR on \fIinterface\fR.
+
+If something goes wrong, socket_mcleave4 returns -1, setting errno
+appropriately.
+.SH "SEE ALSO"
+socket_mcjoin4(3), socket_mcleave6(3), socket_getifidx(3)
diff --git a/socket/socket_mcleave6.3 b/socket/socket_mcleave6.3
new file mode 100644
index 0000000..61902a8
--- /dev/null
+++ b/socket/socket_mcleave6.3
@@ -0,0 +1,14 @@
+.TH socket_mcleave6 3
+.SH NAME
+socket_mcleave6 \- leave a multicast group
+.SH SYNTAX
+.B #include <socket.h>
+
+int \fBsocket_mcleave6\fP(int \fIs\fR, const char \fIgroupip\fR[16], uint32 \fIinterface\fR);
+.SH DESCRIPTION
+socket_mcleave6 leaves the IPv6 multicast group \fIgroupip\fR on \fIinterface\fR.
+
+If something goes wrong, socket_mcleave6 returns -1, setting errno
+appropriately.
+.SH "SEE ALSO"
+socket_mcjoin6(3), socket_mcleave4(3), socket_getifidx(3)