diff --git a/reference/filter/filters.xml b/reference/filter/filters.xml
index 3ab749062b..2a20127c64 100644
--- a/reference/filter/filters.xml
+++ b/reference/filter/filters.xml
@@ -103,7 +103,8 @@
         <entry></entry>
         <entry>
          <constant>FILTER_FLAG_PATH_REQUIRED</constant>,
-         <constant>FILTER_FLAG_QUERY_REQUIRED</constant>
+         <constant>FILTER_FLAG_QUERY_REQUIRED</constant>,
+         <constant>FILTER_FLAG_SCHEME_REQUIRED</constant>
         </entry>
         <entry>Validates value as URL, optionally with required components.</entry>
        </row>
@@ -495,6 +496,15 @@
         Requires the <acronym>URL</acronym> to contain a query string.
        </entry>
       </row>
+      <row>
+       <entry><constant>FILTER_FLAG_SCHEME_REQUIRED</constant></entry>
+       <entry>
+        <constant>FILTER_VALIDATE_URL</constant>
+       </entry>
+       <entry>
+        Requires the <acronym>URL</acronym> to contain a scheme.
+       </entry>
+      </row>
      </tbody>
     </tgroup>
    </table>