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diff --git a/lisp/calc/README b/lisp/calc/README
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@@ -72,6 +72,12 @@ opinions.
Summary of changes to "Calc"
------- -- ------- -- ----
+Emacs 24.1
+
+* Added "O" option prefix.
+
+* Used "O" prefix to "d r" (`calc-radix') to turn on twos-complement mode.
+
Emacs 23.2
* Added twos-complement display.