diff --git a/man5/core.5 b/man5/core.5
index 6c5aeff2b..a358a3a13 100644
--- a/man5/core.5
+++ b/man5/core.5
@@ -106,6 +106,23 @@ operation, and the description of the
 file in
 .BR proc (5).)
 .IP *
+.I /proc/sys/kernel/core_pattern
+is empty and
+.I /proc/sys/kernel/core_uses_pid
+contains the value 0.
+(These files are described below.)
+Note that if
+.I /proc/sys/kernel/core_pattern
+is empty and
+.I /proc/sys/kernel/core_uses_pid
+contains the value 1,
+core dump files will have names of the form
+.IR .pid ,
+and such files are hidden unless one uses the
+.BR ls (1)
+.I -a
+option.
+.IP *
 (Since Linux 3.7)
 .\" commit 046d662f481830e652ac34cd112249adde16452a
 The kernel was configured without the