diff --git a/infodx.htm b/infodx.htm
index bfe21c648..e5e548e7c 100644
--- a/infodx.htm
+++ b/infodx.htm
@@ -14,7 +14,7 @@
   <li><a href="indxal.htm">Cave Descriptions Index</a>.  Recently-explored major caves:
     <ul>
     <!-- modern style is NOT to put .html at the end of these URLs -->
-    <li><a href="1623/290/290">Fischgesicht-H&ouml;hle </a> - FishFace</li>
+    <li><a href="1623/290/290.html">Fischgesicht-H&ouml;hle </a> - FishFace</li>
     <li><a href="1626/359/359.html">Heimkommenh&ouml;hle </a> - Homecoming</li>
     <li><a href="1623/264/264.html">Balkonh&ouml;hle</a></li>
     <li><a href="1623/258/258.html">Tunnockschacht</a></li>