Note that when inplace=1 existing backup files will be removed silently.
Closes SF bug #420230.
diff --git a/Doc/lib/libfileinput.tex b/Doc/lib/libfileinput.tex
index 97caaf9..c66501f 100644
--- a/Doc/lib/libfileinput.tex
+++ b/Doc/lib/libfileinput.tex
@@ -47,7 +47,9 @@
inplace\optional{, backup}}}}
Create an instance of the \class{FileInput} class. The instance
will be used as global state for the functions of this module, and
- is also returned to use during iteration.
+ is also returned to use during iteration. The parameters to this
+ function will be passed along to the constructor of the
+ \class{FileInput} class.
\end{funcdesc}
@@ -118,7 +120,8 @@
\strong{Optional in-place filtering:} if the keyword argument
\code{\var{inplace}=1} is passed to \function{input()} or to the
\class{FileInput} constructor, the file is moved to a backup file and
-standard output is directed to the input file.
+standard output is directed to the input file (if a file of the same
+name as the backup file already exists, it will be replaced silently).
This makes it possible to write a filter that rewrites its input file
in place. If the keyword argument \code{\var{backup}='.<some
extension>'} is also given, it specifies the extension for the backup