diff --git a/api.lua b/api.lua
index 62e8c8f..6c718d9 100644
--- a/api.lua
+++ b/api.lua
@@ -59,7 +59,7 @@ end
 --  @function wconfig.write
 --  @tparam string fname Base filename with optional directory structure (e.g. "my_mod/my_config").
 --  @tparam table data Table data to be written to config file.
---  @tparam bool styled Outputs in a human-readable format if this is set (default: `true`).
+--  @tparam[opt] bool styled Outputs in a human-readable format if this is set (default: `true`).
 --  @treturn bool `true` if succeeded, `false` if not.
 function wconfig.write(fname, data, styled)
 	styled = styled ~= false
diff --git a/docs/api.html b/docs/api.html
index b547dcd..6b876ac 100644
--- a/docs/api.html
+++ b/docs/api.html
@@ -58,7 +58,7 @@
 	<td class="summary">Reads config file from world directory.</td>
 	</tr>
 	<tr>
-	<td class="name" nowrap><a href="#wconfig.write">wconfig.write (fname, data, styled)</a></td>
+	<td class="name" nowrap><a href="#wconfig.write">wconfig.write (fname, data[, styled])</a></td>
 	<td class="summary">Writes to config file in world directory.</td>
 	</tr>
 </table>
@@ -110,7 +110,7 @@
 </dd>
     <dt>
     <a name = "wconfig.write"></a>
-    <strong>wconfig.write (fname, data, styled)</strong>
+    <strong>wconfig.write (fname, data[, styled])</strong>
     </dt>
     <dd>
     Writes to config file in world directory.
@@ -129,6 +129,7 @@
         <li><span class="parameter">styled</span>
             <span class="types"><span class="type">bool</span></span>
          Outputs in a human-readable format if this is set (default: <code>true</code>).
+         (<em>optional</em>)
         </li>
     </ul>
 
@@ -182,7 +183,7 @@
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/stevedonovan/LDoc">LDoc 1.4.6</a></i>
-<i style="float:right;">Last updated 2021-05-27 23:36:42 </i>
+<i style="float:right;">Last updated 2021-05-27 23:43:31 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>