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-rw-r--r--docs/selections.md6
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/selections.md b/docs/selections.md
index 4e26f5ab..7ec58f2b 100644
--- a/docs/selections.md
+++ b/docs/selections.md
@@ -135,3 +135,9 @@ counted; at a line's start or end the whole line; just inside `' " \``
the quoted text; anywhere else the word (letters, digits, `_` and any
non-ASCII character). It works in bodies, tags and a terminal in normal
mode; a terminal whose program has the tty gets its own clicks.
+
+A B2 or B3 pressed while B1 holds a sweep is acme's chord: B1-B2 cuts,
+B1-B3 pastes over it. Everything done while B1 stays down is one undo
+step, as acme marks the file once per B1 hold (text.c:881, textselect), so
+B1-B2 then B1-B3 is a copy: the text cut and pasted back, the cut text
+left in the register.