diff --git a/README.md b/README.md
index 26ddf9a..f39d6cc 100644
--- a/README.md
+++ b/README.md
@@ -107,6 +107,7 @@ A curated list of awesome malware analysis tools and resources. Inspired by
   and statistical analysis of Threat Intelligence feeds.
 * [Massive Octo Spice](https://github.com/csirtgadgets/massive-octo-spice) Previously known as CIF (Collective Intelligence Framework). Aggregates IOCs from various lists. Curated by the [CSIRT Gadgets Foundation](http://csirtgadgets.org/collective-intelligence-framework)
 * [CRITS - Collaborative Research Into Threats](https://crits.github.io/) - Malware and threat repository. Has a lot of integrations with other systems via [Services](https://github.com/crits/crits_services).
+* [PassiveTotal](https://www.passivetotal.org/) - Research, connect, tag and share IPs and domains.
 
 ### Other Resources