diff --git a/tilecloud_chain/templates/admin_index.html b/tilecloud_chain/templates/admin_index.html
index 34ab18b97..12e05f4a4 100644
--- a/tilecloud_chain/templates/admin_index.html
+++ b/tilecloud_chain/templates/admin_index.html
@@ -146,28 +146,31 @@ <h4><code>generate-tiles</code></h4>
     <p>Arguments:</p>
     <ul>
       <li>
-        <code>--layer=NAME</code>: the layer name to generate, it not specified all the layers are generated
+        <code>--layer=NAME</code>: the layer name to generate, it not specified all the layers are generated.
       </li>
       <li>
         <code>--get-hash=Z/X/Y</code>: get the hash configuration for the layer (requires
-        <code>--layer</code>)
+        <code>--layer</code>).
+      </li>
+      <li>
+        <code>--get-bbox=Z/X/Y[:-N/+N]</code>: get the bbox of a tile, use the specified tile
+        <code>Z/X/Y</code>, or <code>Z/X/Y:+N/+N</code> for metatiles (requires <code>--layer</code>).
       </li>
-      <li><code>--get-bbox=Z/X/Y</code>: get the bbox of a tile (requires <code>--layer</code>)</li>
       <li>
         <code>--dimensions DIMENSION=VALUE [DIMENSION=VALUE ...]</code>: overwrite the dimensions values
-        specified in the config file
+        specified in the config file.
       </li>
       <li>
         <code>--zoom=ZOOM</code> restrict to specified zoom level, or a zooms range (2-5), or a zooms list
-        (2,4,5)
+        (2,4,5).
       </li>
-      <li><code>--bbox MINX MINY MAXX MAXY</code>: restrict to specified bounding box</li>
+      <li><code>--bbox MINX MINY MAXX MAXY</code>: restrict to specified bounding box.</li>
       <li>
         <code>--near X Y</code>: This option is a good replacement of <code>--bbox</code>, to used with
         <code>--time</code> or <code>--test</code> and <code>--zoom</code>, implies <code>--no-geom</code>. It
         automatically measure a bbox around the X Y position that corresponds to the metatiles.
       </li>
-      <li><code>--test N</code>: test with generating N tiles</li>
+      <li><code>--test N</code>: test with generating N tiles.</li>
     </ul>
 
     <h4><code>generate-controller --generate-legend-images</code></h4>