diff --git a/ChangeLog.rtro b/ChangeLog.rtro
index e817155..190b9dc 100644
--- a/ChangeLog.rtro
+++ b/ChangeLog.rtro
@@ -5,6 +5,8 @@
 	  ground/Winter/snow.rtro.111.png,
 	  ground/Winter/snow4.rtro.111.png,
 	  ground/Winter/snow5.rtro.111.png: Add some snow and ice tiles used near Brest and at the south pole.
+	* ground/Mountain/moun_cave1.rtro.111.png: Fix incorrect transparency setting.
+	* ground/Mountain/s_moun_cave.rtro.111.png: Fix incorrect transparency setting.
 
 
 2020-09-29 Daniel Hawkins
diff --git a/ground/Mountain/moun_cave1.rtro.111.png b/ground/Mountain/moun_cave1.rtro.111.png
index 6e67d6b..c0081b0 100644
Binary files a/ground/Mountain/moun_cave1.rtro.111.png and b/ground/Mountain/moun_cave1.rtro.111.png differ
diff --git a/ground/Mountain/s_moun_cave.rtro.111.png b/ground/Mountain/s_moun_cave.rtro.111.png
index 6e67d6b..c0081b0 100644
Binary files a/ground/Mountain/s_moun_cave.rtro.111.png and b/ground/Mountain/s_moun_cave.rtro.111.png differ