Small elaboration and typo fixes.
diff --git a/Doc/lib/libdecimal.tex b/Doc/lib/libdecimal.tex
index d573f44..562aae6 100644
--- a/Doc/lib/libdecimal.tex
+++ b/Doc/lib/libdecimal.tex
@@ -22,7 +22,7 @@
\item Decimal numbers can be represented exactly. In contrast, numbers like
\constant{1.1} do not have an exact representation in binary floating point.
-End users typically wound not expect \constant{1.1} to display as
+End users typically would not expect \constant{1.1} to display as
\constant{1.1000000000000001} as it does with binary floating point.
\item The exactness carries over into arithmetic. In decimal floating point,
@@ -538,7 +538,19 @@
rounding method, flags, and traps are applied to the conversion.
This is useful because constants are often given to a greater precision than
- is needed by the application.
+ is needed by the application. Another benefit is that rounding immediately
+ eliminates unintended effects from digits beyond the current precision.
+ In the following example, using unrounded inputs means that adding zero
+ to a sum can change the result:
+
+ \begin{verbatim}
+ >>> getcontext().prec = 3
+ >>> Decimal("3.4445") + Decimal("1.0023")
+ Decimal("4.45")
+ >>> Decimal("3.4445") + Decimal(0) + Decimal("1.0023")
+ Decimal("4.44")
+ \end{verbatim}
+
\end{methoddesc}
\begin{methoddesc}{Etiny}{}
@@ -612,12 +624,14 @@
\begin{methoddesc}{normalize}{x}
Normalize reduces an operand to its simplest form.
- Essentially a plus operation with all trailing zeros removed from the
- result.
+ Essentially a \method{plus} operation with all trailing zeros removed from
+ the result.
\end{methoddesc}
\begin{methoddesc}{plus}{x}
- Minus corresponds to the unary prefix plus operator in Python.
+ Plus corresponds to the unary prefix plus operator in Python. This
+ operation applies the context precision and rounding, so it is
+ \emph{not} an identity operation.
\end{methoddesc}
\begin{methoddesc}{power}{x, y\optional{, modulo}}