diff --git a/cave_data/pendingcaves.txt b/cave_data/pendingcaves.txt
index a10dd7129..1230b17c3 100644
--- a/cave_data/pendingcaves.txt
+++ b/cave_data/pendingcaves.txt
@@ -8,6 +8,7 @@
 1626-E16
 1626-E28
 1626-upside-down
+1623-rentner
 1623-2007-06
 1623-2009-02
 1623-2010-04