Allow for more than one config file.

[gsu.git] / README.md

diff --git a/README.md b/README.md
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+++ b/README.md
@@ -651,6 +651,13 @@ following two statements are equivalent
 If an option is set both in the environment and in the config file,
 the environment takes precedence.
 
+The `$gsu_config_file` variable can actually contain more than one
+filename, separated by spaces. The config files are processed in
+order, so that an option that is specified in the second config file
+overwrites the definition given in the first. This is useful for
+applications which implement a system-wide config file in addition
+to a per-user config file.
+
 ___Checking config options___
 
 The gsu config module defines two public functions for this purpose: