diff --git a/config/example-ip-blacklist.txt b/config/example-ip-blacklist.txt
index 5622c03..aad5f46 100644
--- a/config/example-ip-blacklist.txt
+++ b/config/example-ip-blacklist.txt
@@ -3,6 +3,10 @@
 ##############################
 
 ## Response containing blacklisted IP addresses will be blocked
+##
+## Sample feed of suspect IP addresses: https://github.com/stamparm/ipsum
+## Use only one of the levels from that list. 1 is not very reliable
+## (may have a lot of false positives), 8 is the most reliable subset.
 
 163.5.1.4
 94.46.118.*