diff --git a/extensions/firefox/install.rdf b/extensions/firefox/install.rdf
index 84bc31d04..f4e6b43ea 100644
--- a/extensions/firefox/install.rdf
+++ b/extensions/firefox/install.rdf
@@ -21,6 +21,7 @@
     <em:description>pdf.js uri loader</em:description>
     <em:homepageURL>https://github.com/mozilla/pdf.js/</em:homepageURL>
     <em:type>2</em:type>
+    <!-- Use the raw link for updates so we we can use SSL. -->
     <em:updateURL>https://github.com/mozilla/pdf.js/raw/gh-pages/extensions/firefox/update.rdf</em:updateURL>
   </Description>
 </RDF>
diff --git a/extensions/firefox/update.rdf b/extensions/firefox/update.rdf
index e95b114b5..c12e53dc6 100644
--- a/extensions/firefox/update.rdf
+++ b/extensions/firefox/update.rdf
@@ -14,7 +14,7 @@
                 <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
                 <em:minVersion>6.0</em:minVersion>
                 <em:maxVersion>11.*</em:maxVersion>
-                <!-- Use the raw link so we we can use SSL. -->
+                <!-- Use the raw link for updates so we we can use SSL. -->
                 <em:updateLink>https://github.com/mozilla/pdf.js/raw/gh-pages/extensions/firefox/pdf.js.xpi</em:updateLink>
               </RDF:Description>
             </em:targetApplication>