diff --git a/README.md b/README.md
index 2df8169..43f7b55 100644
--- a/README.md
+++ b/README.md
@@ -110,6 +110,8 @@ A curated list of awesome malware analysis tools and resources. Inspired by
   from various lists. Curated by the [CSIRT Gadgets Foundation](http://csirtgadgets.org/collective-intelligence-framework).
 * [MISP](https://github.com/MISP/MISP) - Malware Information Sharing
   Platform curated by [The MISP Project](http://www.misp-project.org/).
+* [PassiveTotal](https://www.passivetotal.org/) - Research, connect, tag and
+  share IPs and domains.
 * [threataggregator](https://github.com/jpsenior/threataggregator) -
   Aggregates security threats from a number of sources, including some of
   those listed below in [other resources](#other-resources).