Added note about restarting the web server.

Author: mbeijen

Custom/README

@@ -9,3 +9,6 @@ Example:
 
 This method also works for DTL files. Just place them in Kernel/Output/HTML/$ThemeName,
 and they will be used if the theme is selected.
+
+If you use Apache + mod_perl or PerlEx, any Perl module files placed in this directory 
+will only be loaded by your web server after you restarted it.