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diff --git a/puzzles.but b/puzzles.but
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--- a/puzzles.but
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@@ -2751,6 +2751,9 @@ Right-clicking again places two question marks on the domino, signifying
\q{this cannot be blank} (which can be useful to note deductions while
solving), and right-clicking again empties the domino.
+Left-clicking a clue will mark it as done (grey it out), or unmark it if
+it is already marked.
+
You can also use the cursor keys to move a cursor around the grid.
Pressing the return key will lay a domino with a positive pole at that
position; pressing again reverses the polarity and then removes the