diff --git a/man7/unix.7 b/man7/unix.7
index 60570b9d0..3ee333d61 100644
--- a/man7/unix.7
+++ b/man7/unix.7
@@ -150,6 +150,23 @@ ancillary message.
 When this option is set and the socket is not yet connected
 a unique name in the abstract namespace will be generated automatically.
 Expects an integer boolean flag.
+.SS Autobind Feature
+If a
+.BR bind ()
+call specifies
+.I addrlen
+as
+.IR sizeof(sa_family_t) ,
+.\" i.e. sizeof(short)
+or the
+.BR SO_PASSCRED
+socket option was specified for a socket that was
+not explicitly bound to an address,
+then the socket is autobound to an abstract address.
+The address consists of a null byte
+followed by 5 bytes in the character set
+.IR [0-9a-f] .
+(Thus, there is a limit of 2^20 autobind addresses.)
 .SS Sockets API
 The following paragraphs describe domain-specific details and
 unsupported features of the sockets API for Unix domain sockets on Linux.