diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 2f4ee701f6..0d01c16ddb 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -13722,6 +13722,9 @@
                             a secure shell.</para></listitem>
                         <listitem><para><emphasis><filename>svn://</filename> -</emphasis> Fetches files from
                             a Subversion (<filename>svn</filename>) revision control repository.</para></listitem>
+                        <listitem><para><emphasis><filename>npm://</filename> -</emphasis> Fetches JavaScript
+                            modules from a registry.
+                            </para></listitem>
                     </itemizedlist>
                 </para>