diff -up ./sysctl.8.ori ./sysctl.8

--- ./sysctl.8.ori	2014-09-23 13:40:36.000000000 +0200

+++ ./sysctl.8	2017-05-31 14:43:08.323364474 +0200

@@ -78,7 +78,7 @@ values listing.

 Print value without new line.

 .TP

 \fB\-\-system\fR

-Load settings from all system configuration files.

+Load settings from all system configuration files. Files are read from directories in the following list in given order from top to bottom. Once a file of a given filename is loaded, any file of the same name in subsequent directories is ignored.

 .br

 /run/sysctl.d/*.conf

 .br