diff --git a/man2/fcntl.2 b/man2/fcntl.2
index accadee93..843d508fa 100644
--- a/man2/fcntl.2
+++ b/man2/fcntl.2
@@ -1914,7 +1914,8 @@ and
 Several systems have more fields in
 .I "struct flock"
 such as, for example,
-.IR l_sysid .
+.IR l_sysid
+(to identify the machine where the lock is held).
 .\" e.g., Solaris 8 documents this field in fcntl(2), and Irix 6.5
 .\" documents it in fcntl(5).  mtk, May 2007
 .\" Also, FreeBSD documents it (Apr 2014).