diff --git a/header.tpl b/header.tpl
index fc3ea8e..f25a0e6 100644
--- a/header.tpl
+++ b/header.tpl
@@ -180,7 +180,7 @@
       <div class="menu-item">
         <img class="top-icon" src="img/update-icon.svg" alt="update icon"/>
         <a
-        href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2020-01-26</a>
+        href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2020-01-31</a>
       </div>
       <div class="menu-item">
         <img class="top-icon" src="img/donate-icon.svg" alt="donate icon"/>
diff --git a/references.bib b/references.bib
index 50a2c33..c50067a 100644
--- a/references.bib
+++ b/references.bib
@@ -1,3 +1,11 @@
+@techreport{Fifield2016b,
+	author = {David Fifield and Mia Gil Epner},
+	title = {Fingerprintability of {WebRTC}},
+	institution = {University of California, Berkeley},
+	year = {2016},
+	url = {https://arxiv.org/pdf/1605.08805.pdf}
+}
+
 @techreport{Appelbaum2012a,
 	author = {Jacob Appelbaum},
 	title = {Technical analysis of the {Ultrasurf} proxying software},