diff --git a/_sources/dev/search_api.txt b/_sources/dev/search_api.txt
index c1bc6a13..03bb6f3f 100644
--- a/_sources/dev/search_api.txt
+++ b/_sources/dev/search_api.txt
@@ -16,18 +16,18 @@ Furthermore, two enpoints ``/`` and ``/search`` are available for querying.
 Parameters
 ``````````
 
-+------------------+----------------------------------------------------------------------------------------------------+-----------------------------+
-| Name             | Description                                                                                        |                             |
-+==================+====================================================================================================+=============================+
-| ``q``            | The search query, see :doc:`/user/search_syntax`                                                   | required                    |
-+------------------+----------------------------------------------------------------------------------------------------+-----------------------------+
-| ``categories``   | Comma separated list, specifies the active search categories                                       | optional                    |
-+------------------+----------------------------------------------------------------------------------------------------+-----------------------------+
-| ``engines``      | Comma separated list, specifies the active search engines                                          | optional                    |
-+------------------+----------------------------------------------------------------------------------------------------+-----------------------------+
-| ``lang``         | Code of the language                                                                               | optional (default: ``all``) |
-+------------------+----------------------------------------------------------------------------------------------------+-----------------------------+
-| ``pageno``       | Search page number                                                                                 | optional (default: ``1``)   |
-+------------------+----------------------------------------------------------------------------------------------------+-----------------------------+
-| ``time_range``   | Time range of search                                                                               | optional                    |
-+------------------+----------------------------------------------------------------------------------------------------+-----------------------------+
++------------------+----------------------------------------------------------------------------------------------------+--------------------------------------------------+
+| Name             | Description                                                                                        |                                                  |
++==================+====================================================================================================+==================================================+
+| ``q``            | The search query, see :doc:`/user/search_syntax`                                                   | required                                         |
++------------------+----------------------------------------------------------------------------------------------------+--------------------------------------------------+
+| ``categories``   | Comma separated list, specifies the active search categories                                       | optional                                         |
++------------------+----------------------------------------------------------------------------------------------------+--------------------------------------------------+
+| ``engines``      | Comma separated list, specifies the active search engines                                          | optional                                         |
++------------------+----------------------------------------------------------------------------------------------------+--------------------------------------------------+
+| ``lang``         | Code of the language                                                                               | optional (default: ``all``)                      |
++------------------+----------------------------------------------------------------------------------------------------+--------------------------------------------------+
+| ``pageno``       | Search page number                                                                                 | optional (default: ``1``)                        |
++------------------+----------------------------------------------------------------------------------------------------+--------------------------------------------------+
+| ``time_range``   | Time range of search                                                                               | optional (possible: ``day``, ``month``, ``year``)|
++------------------+----------------------------------------------------------------------------------------------------+--------------------------------------------------+
diff --git a/dev/search_api.html b/dev/search_api.html
index e27aa7dd..f81d332f 100644
--- a/dev/search_api.html
+++ b/dev/search_api.html
@@ -53,9 +53,9 @@
 <h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
 <table border="1" class="docutils">
 <colgroup>
-<col width="12%" />
-<col width="68%" />
-<col width="20%" />
+<col width="11%" />
+<col width="60%" />
+<col width="30%" />
 </colgroup>
 <thead valign="bottom">
 <tr class="row-odd"><th class="head">Name</th>
@@ -86,7 +86,7 @@
 </tr>
 <tr class="row-odd"><td><code class="docutils literal"><span class="pre">time_range</span></code></td>
 <td>Time range of search</td>
-<td>optional</td>
+<td>optional (possible: <code class="docutils literal"><span class="pre">day</span></code>, <code class="docutils literal"><span class="pre">month</span></code>, <code class="docutils literal"><span class="pre">year</span></code>)</td>
 </tr>
 </tbody>
 </table>