diff --git a/man2/getrlimit.2 b/man2/getrlimit.2
index 099fb56ec..414fb2586 100644
--- a/man2/getrlimit.2
+++ b/man2/getrlimit.2
@@ -321,6 +321,18 @@ to exceed this limit yield the error
 (Historically, this limit was named
 .B RLIMIT_OFILE
 on BSD.)
+
+Since Linux 4.5,
+this limit also defines the maximum number of file descriptors that 
+an unprivileged process (one without the
+.BR CAP_SYS_RESOURCE
+capability) may have "in flight" to other processes,
+by being passed across UNIX domain sockets.
+This limit applies to the
+.BR sendmsg (2)
+system call.
+For further details, see
+.BR unix (7).
 .TP
 .B RLIMIT_NPROC
 This is the maximum number of processes