diff --git a/README.md b/README.md
index f711e06e..a5e0e25b 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ Passive:
 
 * google-profiles: Google search engine, specific search for Google profiles
 
-* hunter: Hunter search engine (Requires API key, see below.)
+* hunter: Hunter search engine (Requires API key, see below.) www.hunter.io
 
 * linkedin: Google search engine, specific search for Linkedin users
 
@@ -57,12 +57,15 @@ Passive:
 
 * pgp: PGP key server - mit.edu
 
+* securitytrails: Security Trails search engine, the world's largest repository of historical DNS data 
+                  (Requires API key, see below.) - www.securitytrails.com/
+
 * shodan: Shodan search engine, will search for ports and banners from discovered
           hosts - www.shodanhq.com
 
 * threatcrowd: Open source threat intelligence - www.threatcrowd.org
 
-* trello:
+* trello: Search trello boards (Uses Google search.)
 
 * twitter: Twitter accounts related to a specific domain (Uses Google search.)
 
@@ -84,6 +87,7 @@ Modules that require an API key:
 --------------------------------
 * googleCSE: add your API key and CSE ID to discovery/googleCSE.py
 * hunter: add your API key to discovery/huntersearch.py 
+* securitytrails: add your API key to discovery/securitytrailssearch.py:
 * shodan: add your API key to discovery/shodansearch.py
 
 Dependencies:
diff --git a/discovery/__init__.py b/discovery/__init__.py
index a937c223..ad7da001 100644
--- a/discovery/__init__.py
+++ b/discovery/__init__.py
@@ -23,4 +23,5 @@ __all__ = ["bingsearch",
            "googlecertificates",
            "googleCSE",
            "censys",
+           "securitytrailssearch",
            "trello"]
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