Specify dash in command

Author: retokromer

index.html

@@ -1506,7 +1506,7 @@ <h5>Check video file interlacement patterns</h5>
         <dt>-i <em>input_file</em></dt><dd>path, name and extension of the input file</dd>
         <dt>-filter:v idet</dt><dd>This calls the <a href="https://ffmpeg.org/ffmpeg-filters.html#idet" target="_blank">idet (detect video interlacing type) filter</a>.</dd>
         <dt>-f null</dt><dd>Video is decoded with the <code>null</code> muxer. This allows video decoding without creating an output file.</dd>
-        <dt>-</dt><dd>FFmpeg syntax requires a specified output, and <code>-</code> is just a place holder. No file is actually created.</dd>
+        <dt>-</dt><dd>The FFmpeg syntax requires a specified output, and <code>-</code> prints the output to the screen (stdout), rather than creating a file.</dd>
       </dl>
       <p class="link"></p>
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