add instruction on using -- on command-line

diff --git a/doc/html/documentation.html b/doc/html/documentation.html
index b7e805b..0d8aa7e 100644 (file)
--- a/doc/html/documentation.html
+++ b/doc/html/documentation.html
@@ -263,6 +263,14 @@
        <P>
                Also, you can force output data to go to stdout using <TT>-c</TT>.
        </P>
+       <P>
+               To encode or decode files that start with a dash, use <TT>--</TT> to signal the end of options, to keep the filenames themselves from being treated as options:
+               <UL>
+               <LI>
+                       <TT>flac -V -- -01-filename.wav</TT>
+               </LI>
+               </UL>
+       </P>
        <P>The encoding options affect the compression ratio and encoding speed.  The format options are used to tell <B><TT>flac</TT></B> the arrangement of samples if the input file (or output file when decoding) is a raw file.  If it is a RIFF WAVE or AIFF file the format options are not needed since they are read from the AIFF/WAVE header.
        </P>
        <P>