diff --git a/ChangeLog.rtro b/ChangeLog.rtro
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--- a/ChangeLog.rtro
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@@ -1,3 +1,6 @@
+2020-09-28 Daniel Hawkins
+	* ground/deep_swamp.rtro.11*.png: Fix transparency index.
+
 2020-09-27 Daniel Hawkins
 	* inorganic/lstone.rtro.111.png: Correct conversion of green from old xpm data.
 	* floor/inlayed/*.rtro.1*.png: Fixed incorrect transparency setting.
diff --git a/ground/deep_swamp.rtro.111.png b/ground/deep_swamp.rtro.111.png
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