diff --git a/doc/src/sgml/external-projects.sgml b/doc/src/sgml/external-projects.sgml
index 88094c19ea..3b51e480f7 100644
--- a/doc/src/sgml/external-projects.sgml
+++ b/doc/src/sgml/external-projects.sgml
@@ -190,7 +190,7 @@
      <row>
       <entry>PL/R</entry>
       <entry>R</entry>
-      <entry><ulink url="http://www.joeconway.com/plr/"></ulink></entry>
+      <entry><ulink url="http://www.joeconway.com/plr.html"></ulink></entry>
      </row>
 
      <row>