--- a/exim4.conf	Fri Dec 20 23:39:18 2013 +0100
+++ b/exim4.conf	Fri Dec 20 23:43:00 2013 +0100
@@ -1,7 +1,9 @@
 # this is by no way a complete configuration file!
 # it's just intended as a starting point
+# source: hg clone http://ssl.schlittermann.de/hg/exim-smart-config
 
 # The providers file
+# ------------------
 # All relevant information about the smart providers is stored
 # in one place. This place is the "providers" file. The structure
 # is simple. It consists of lines as in the example: