diff --git a/src/main/resources/documentation/header.rqg b/src/main/resources/documentation/header.rqg
index 56284b5c50ca4a9e3099a205524f400134a60820..859545abd6f9d8205816cc26859e91ffa4e53022 100644
--- a/src/main/resources/documentation/header.rqg
+++ b/src/main/resources/documentation/header.rqg
@@ -73,7 +73,7 @@ TEMPLATE <head.rqg>( ?before, ?pathToStatic , ?isOntologyDocumentation ) {
               </a>
             </div>
           </div>
-          <div class="g-block size-50">
+          <div class="g-block size-65">
             <div class="g-content g-particle">
               <nav class="g-main-nav" role="navigation" data-g-hover-expand="true">
                 <ul class="g-toplevel">
@@ -119,11 +119,17 @@ TEMPLATE <head.rqg>( ?before, ?pathToStatic , ?isOntologyDocumentation ) {
                     </a>
                   </li>
 
+                  <li class="g-menu-item g-menu-item-type-component g-menu-item-242 g-standard">
+                    <form method="GET" action="search.html">
+                      <input class="form-control" id="q" name="q" placeholder="&#x1F50E; ex., device"/>
+                    </form>
+                  </li>
+
                 </ul>
               </nav>
             </div>
           </div>
-          <div class="g-block g-social-header size-33">
+          <div class="g-block g-social-header size-17">
             <div class="g-content g-particle">
               <div class="g-social ">
                 <a target="_blank" href="https://twitter.com/ETSI_STANDARDS" title="" aria-label="">