Added menu and keybinding for ledger-post-edit-amount

editing the amount with calc is too cool for school.  I can't believe I didn't see it before.
It is in the docs now as well.

1 files changed, 13 insertions, 0 deletions

diff --git a/doc/ledger3.texi b/doc/ledger3.texi
index be7d7e98..815c770b 100644
--- a/doc/ledger3.texi
+++ b/doc/ledger3.texi
@@ -2403,6 +2403,7 @@ kill the ledger report buffer
 * Manual Entry Support::        
 * Automagically Adding new entries::  
 * Clearing Transactions::       
+* Calculating Values with EMACS Calc::  
 @end menu
 
 @node Manual Entry Support, Automagically Adding new entries, Working with entries, Working with entries
@@ -2487,6 +2488,18 @@ If, for some reason you need to clear a specific posting in the
 transaction you can type @code{C-c C-c} and the posting at point will be
 toggled.
 
+@node Calculating Values with EMACS Calc,  , Clearing Transactions, Working with entries
+@subsubsection  Calculating Values with EMACS Calc
+
+EMACS come with a very power calculator built in.  You can use it to
+easily insert calculated amounts directly into your ledger buffer.  From
+the menu, select @code{Calc on Amount}. Calc will pull the current
+amount to the top of the calc stack. Calulate the value as you normally
+would with an RPN calculator.  When you have the desired value on thetop
+of the calc stack, press @code{y}, and calc will insert the value
+in place of the previous amount.
+
+
 @node Reconciling accounts, Generating Reports, Working with entries, Using EMACS
 @subsection Reconciling accounts