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diff --git a/docs/elements/bd_butterfly.txt b/docs/elements/bd_butterfly.txt
index 1eadc59b..3cf63425 100644
--- a/docs/elements/bd_butterfly.txt
+++ b/docs/elements/bd_butterfly.txt
@@ -1,2 +1,6 @@
-BD style butterflies always try to follow the right side of a wall
-or other elements. Touching them is deadly.
+Butterflies move through empty space. Touching them is deadly.. Butterflies
+blow up when hit by a falling rock or diamond. Amoeba is also deadly for them.
+They explode into diamonds, producing a 3x3 square of diamonds. Butterflies are
+spinning right. They prefer turning right, usually clockwise.
+
+There is another variant of the butterfly that is spinning left.