diff --git a/src/zammad/install-service.sh b/src/zammad/install-service.sh
index e7587ac..67302dc 100644
--- a/src/zammad/install-service.sh
+++ b/src/zammad/install-service.sh
@@ -30,6 +30,7 @@ cat << EOF >>/etc/hosts
 0.0.0.0 geoip.elastic.co
 EOF
 
+# Java set startup environment 
 mkdir -p /etc/elasticsearch/jvm.options.d
 cat << EOF >>/etc/elasticsearch/jvm.options.d/msmx-size.options
 # INFO: https://www.elastic.co/guide/en/elasticsearch/reference/master/advanced-configuration.html#set-jvm-heap-size
@@ -97,13 +98,17 @@ server {
 #  https://webdock.io/en/docs/how-guides/security-guides/how-to-configure-security-headers-in-nginx-and-apache
 #
     add_header Strict-Transport-Security 'max-age=31536000; includeSubDomains; preload';
-	add_header Content-Security-Policy "default-src 'self'; font-src *;img-src * data:; script-src *; style-src *";
-	add_header Referrer-Policy "strict-origin";
-	add_header X-Frame-Options DENY;
-	add_header X-Content-Type-Options nosniff;
-	add_header X-XSS-Protection "1; mode=block";
-	add_header Permissions-Policy "geolocation=(),midi=(),sync-xhr=(),microphone=(),camera=(),magnetometer=(),gyroscope=(),fullscreen=(self),payment=()";
-
+    add_header Content-Security-Policy "default-src 'self'; font-src *;img-src * data:; script-src *; style-src *";
+    add_header Referrer-Policy "strict-origin";
+    add_header X-Frame-Options DENY;
+    add_header X-Content-Type-Options nosniff;
+    add_header X-XSS-Protection "1; mode=block";
+    add_header Permissions-Policy "geolocation=(),midi=(),sync-xhr=(),microphone=(),camera=(),magnetometer=(),gyroscope=(),fullscreen=(self),payment=()";
+    
+    location = /robots.txt  {
+    access_log off; log_not_found off;
+    }
+    
     location = /favicon.ico {
     access_log off; log_not_found off;
     }