diff --git a/Customising-sources-for-ad-lists.md b/Customising-sources-for-ad-lists.md
index 1ac0568..5690cd1 100644
--- a/Customising-sources-for-ad-lists.md
+++ b/Customising-sources-for-ad-lists.md
@@ -12,6 +12,8 @@ http://mirror1.malwaredomains.com/files/justdomains
 
 There are [many block-lists available on the Internet](https://pi-hole.net/faq/how-do-i-add-another-domain-source-list-to-the-pi-hole/), and we have not tried and tested them all, but we have found the above listed to be reliable. 
 
+One such list is `http://adblock.mahakala.is/`, though be warned, they have been known to block a lot of legitimate sites, including the entire `.com` range...
+
 If you wish to remove any of these lists, or add your own on top, then make a copy of `adlists.default` and call it `adlists.list`. This will tell `gravity.sh` that you are using a custom list, and not the defaults.
 
 To do this, use the following commands: