Add twos complement, center-click anywhere to paste.

1 files changed, 26 insertions, 17 deletions

diff --git a/hcalc.rst b/hcalc.rst
index 314944e..7611248 100644
--- a/hcalc.rst
+++ b/hcalc.rst
@@ -95,6 +95,10 @@ buttons. Each button can be pressed either by clicking on it with the
 mouse, or pressing its keystroke (given in **bold**). A few buttons
 have multiple functions, depending on which mouse button is used.
 
+The descriptions below assume a right-handed mouse, and refer to mouse
+button 1 as "left" and button 3 as "right". If your mouse is set up
+left-handed, reverse them.
+
 *0* to *9*, *A* to *F* (**0-9**, **a-f**)
   Digits. Lowercase only for the hex digits. Entering digits
   larger than the current number base is impossible (e.g. hex digits
@@ -116,14 +120,16 @@ have multiple functions, depending on which mouse button is used.
   Invert sign.
 
 *INV* (**~**)
-  Unary NOT; invert the bits in the current number.
+  Unary NOT, aka 1's complement; invert the bits in the current number.
+  For 32-bit two's complement, right-click or use **@** on the keyboard.
+  Integer operation; truncates digits after the decimal point.
 
 *OR* *AND* *XOR* (**&** **|** **^**)
-  Boolean operations.
+  Boolean operations. Integer operations; truncates digits after the decimal point.
 
 *DEC* *HEX* *OCT* *BIN* (**D** **H** **O** **B** or **F1** to **F4**)
   Change the number base. The number being displayed will be converted
-  to the new base.
+  to the new base. Truncates digits after the decimal point.
 
 *DEL* (**Backspace** or **Delete**)
   Delete the last digit entered. Deleting the last digit results in 0.
@@ -132,8 +138,9 @@ have multiple functions, depending on which mouse button is used.
   Store to memory (like *M* on most calculators); recall memory (like *MR*);
   add current value to memory (like *M+*).
 
-*<<** *>>* (**<** **>**)
+*<<* *>>* (**<** **>**)
   Bit shift by one position, left or right.
+  Integer operation; truncates digits after the decimal point.
 
 *SHF* (**S**)
   Shift left/right by some number of bits (binary
@@ -141,6 +148,7 @@ have multiple functions, depending on which mouse button is used.
   numbers and right for negative. This is less confusing
   than it sounds: 1 shifted left once is 2, -1 shifted right
   once in -2.
+  Integer operation; truncates digits after the decimal point.
 
 *CE* (**u**)
   Clears the number being entered, same as backspacing over it,
@@ -153,22 +161,23 @@ have multiple functions, depending on which mouse button is used.
 MOUSE
 =====
 
-Mouse operation is simple: for the most part, just click on the
+Mouse operation is simple: for the most part, just left-click on the
 buttons to press them.
 
 There's no *%* button for the modulus operator, but you can
-right-click on the *÷* (division) key.
-
-Right-clicking (or any button other than 1) on the *CLR* key exits
-**hcalc**.
-
-For the numeric display, clicking button 1 (usually the left one)
-copies the number to the X selection buffer. Clicking any other
-button pastes from X, but beware: pasting anything but a number in
-the current base might have unexpected effects, because all pasted
-characters are treated as keystrokes (so, e.g. pasting a capital Q
-quits the application). This can be useful, e.g. if you paste "2+2=",
-**hcalc** will display "4".
+right-click on the *÷* (division) key. Also, right-click on
+the *INV* key for two's complement.
+
+Right-clicking on the *CLR* key exits **hcalc**.
+
+For the numeric display, a left-click copies the number to the X
+selection buffer.  Right-click pastes from X, but beware: pasting
+anything but a number in the current base might have unexpected
+effects, because all pasted characters are treated as keystrokes (so,
+e.g. pasting a capital Q quits the application). This can be useful,
+e.g. if you paste "2+2=", **hcalc** will display "4".
+
+A center-click (button 2) anywhere in the **hcalc** window also pastes.
 
 KEYBOARD
 ========