diff --git a/README.md b/README.md
index 88aac3b..d46e21d 100644
--- a/README.md
+++ b/README.md
@@ -606,7 +606,7 @@ All kinds of tools for parsing, creating and editing Threat Intelligence. Mostly
             <a href="https://cse.google.com/cse/publicurl?cx=003248445720253387346:turlh5vi4xc" target="_blank">Google APT Search Engine</a>
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-            APT Groups, Operations and Malware Search Engine.
+            APT Groups, Operations and Malware Search Engine. The sources used for this Google Custom Search are listed on <a href="https://gist.github.com/Neo23x0/c4f40629342769ad0a8f3980942e21d3" target="_blank"this</a> GitHub gist.
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