diff --git a/src/README.org b/src/README.org
index 1345293..76e7904 100644
--- a/src/README.org
+++ b/src/README.org
@@ -2,6 +2,11 @@
 #+PROPERTY: comments org
 #+SETUPFILE: ../docs/theme.setup
 
+#+BEGIN_EXPORT html
+<script async src="https://cse.google.com/cse.js?cx=a67f8ab65a66f97f2"></script>
+<div class="gcse-search"></div>  
+#+END_EXPORT
+
 ------------------
 
    - [[./tutorial_benzene.html][Tutorial]]
diff --git a/tools/build_doc.sh b/tools/build_doc.sh
index 1c7f366..bd932e2 100755
--- a/tools/build_doc.sh
+++ b/tools/build_doc.sh
@@ -123,7 +123,12 @@ function main() {
     then
         cd ${DOCS}
         rm -f index.html
-        ln README.html index.html
+	# enter Google verificator into the HTML head
+        local GOOGLE_VERIF="<meta name="google-site-verification" content="jdDnuP2rYGJVy8AHSd-8LkmOmvK_dyz5buZ98wilYII" />"
+        LINE_NO=$(($(awk '/meta name="viewport"/{print NR}' README.html) + 1))
+        sed -i "$LINE_NO i ${GOOGLE_VERIF}" README.html
+        
+	ln README.html index.html
         exit 0
     else
         exit 3