add instruction on using -- on command-line
diff --git a/doc/html/documentation.html b/doc/html/documentation.html
index b7e805b..0d8aa7e 100644
--- 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>