README.keystrokes: add documentation for branding behavior.

README.keystrokes

@@ -6,13 +6,21 @@ by the user. This is done via a configuration file.
 File location
 -------------
 
-nxagent searches for the configuration file in the following order:
+nxagent parses the first available configuration file and ignores all others.
+
+If nxagent is called without branding, it searches:
 - in the location given by the '-keystrokefile' command line parameter
 - in the location given by the NXAGENT_KEYSTROKEFILE environment variable
 - in ~/.nx/config/keystrokes.cfg
 - in /etc/nxagent/keystrokes.cfg
 
-If none of those files is accessible, the default configuration is used which
+If nxagent is called **with X2Go branding** (i.e., as x2goagent), it searches:
+- in the location given by the '-keystrokefile' command line parameter
+- in the location given by the NXAGENT_KEYSTROKEFILE environment variable
+- in ~/.x2go/config/keystrokes.cfg
+- in /etc/x2go/keystrokes.cfg
+
+If none of these files are accessible, the default configuration is used which
 is the same as the old, traditional nxagent keybindings.
 
 File format