diff --git a/www/command-line-options.html b/www/command-line-options.html
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--- a/www/command-line-options.html
+++ b/www/command-line-options.html
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 <p>Below is list of command-line options recognized by the ImageMagick <a href="../www/command-line-tools.html">command-line tools</a>. If you want a description of a particular option, click on the option name in the navigation bar above and you will go right to it. Unless otherwise noted, each option is recognized by the commands
@@ -503,10 +503,13 @@
 <table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Use black point compensation.</td><td style='text-align:right;'></td></tr></table>
 
 <div style="margin: auto;">
-  <h4><a name="black-threshold" id="black-threshold"></a>-black-threshold <em class="arg">threshold</em></h4>
+  <h4><a name="black-threshold" id="black-threshold"></a>-black-threshold <em class="arg">value</em>{<em class="arg">%</em>}</h4>
 </div>
 
-<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Force to black all pixels at or below the threshold while leaving all pixels above the threshold unchanged.</td><td style='text-align:right;'></td></tr></table>
+<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Force to black all pixels below the threshold while leaving all pixels at or above the threshold unchanged.</td><td style='text-align:right;'></td></tr></table>
+
+<p> The threshold value can be given as a percentage or as an absolute integer value within [0,&nbsp;<em class="QR">QuantumRange</em>] corresponding to the desired <a href="../www/command-line-options.html#channel">&#x2011;channel</a> value. See <a href="../www/command-line-options.html#threshold">&#x2011;threshold</a> for more details on thresholds and resulting values.
+</p>
 
 
 <div style="margin: auto;">
@@ -5478,10 +5481,13 @@
 <table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>chromaticity white point.</td><td style='text-align:right;'></td></tr></table>
 
 <div style="margin: auto;">
-  <h4><a name="white-threshold" id="white-threshold"></a>-white-threshold <em class="arg">threshold</em></h4>
+  <h4><a name="white-threshold" id="white-threshold"></a>-white-threshold <em class="arg">value</em>{<em class="arg">%</em>}</h4>
 </div>
 
-<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Force to white all pixels at or above the threshold.</td><td style='text-align:right;'></td></tr></table>
+<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Force to white all pixels above the threshold while leaving all pixels at or below the threshold unchanged.</td><td style='text-align:right;'></td></tr></table>
+
+<p> The threshold value can be given as a percentage or as an absolute integer value within [0,&nbsp;<em class="QR">QuantumRange</em>] corresponding to the desired <a href="../www/command-line-options.html#channel">&#x2011;channel</a> value. See <a href="../www/command-line-options.html#threshold">&#x2011;threshold</a> for more details on thresholds and resulting values.
+</p>
 
 <div style="margin: auto;">
   <h4><a name="window" id="window"></a>-window <em class="arg">id</em></h4>
@@ -5518,7 +5524,7 @@
     <span id="linkbar-center">
       <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
       <a href="../www/mailing-list.html">Mailing Lists</a> &bull;
-    <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
+    <a href="http://studio.webbyland.com/ImageMagick/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
     </span>
     <span id="linkbar-east">&nbsp;</span>
   </div>