diff --git a/CHANGES.rst b/CHANGES.rst
index 524effd..271c797 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -6,6 +6,8 @@ Changelog
 
 - Use Varnish 6.0.13 LTS [mamico]
 
+- Add vcl_synth options to insert arbitrary vcl. [mamico]
+
 
 6.0.11 (2023-08-18)
 -------------------
diff --git a/README.rst b/README.rst
index 7bad462..9444d3b 100644
--- a/README.rst
+++ b/README.rst
@@ -308,7 +308,7 @@ These options are available for the recipe part plone.recipe.varnish:configurati
     Specifies hostnames or IP addresses for purge ACL. By default ``localhost`` and
     the backends are allowed to purge. Additional allowed hosts are listed here.
 
-``vcl_recv``, ``vcl_hit``, ``vcl_miss``, ``vcl_backend_fetch``, ``vcl_backend_response``, ``vcl_deliver``, ``vcl_pipe``, ``vlc_purge``, ``vcl_hash``, ``vcl_import``, ``vcl_init``, ``vcl_pass``
+``vcl_recv``, ``vcl_hit``, ``vcl_miss``, ``vcl_backend_fetch``, ``vcl_backend_response``, ``vcl_deliver``, ``vcl_pipe``, ``vlc_purge``, ``vcl_hash``, ``vcl_import``, ``vcl_init``, ``vcl_pass``, ``vcl_synth``
     Insert arbitrary VCL code into the generated config.
 
 ``verbose-headers``
diff --git a/plone/recipe/varnish/recipe.py b/plone/recipe/varnish/recipe.py
index 714c7e6..d2217f9 100644
--- a/plone/recipe/varnish/recipe.py
+++ b/plone/recipe/varnish/recipe.py
@@ -300,6 +300,7 @@ def create_varnish_configuration(self):
             "vcl_pipe",
             "vcl_backend_response",
             "vcl_hash",
+            "vcl_synth",
         ):
             config["custom"][name] = self.options.get(name, "")
 
diff --git a/plone/recipe/varnish/templates/varnish6.vcl.jinja2 b/plone/recipe/varnish/templates/varnish6.vcl.jinja2
index 80dbabe..cd0d254 100644
--- a/plone/recipe/varnish/templates/varnish6.vcl.jinja2
+++ b/plone/recipe/varnish/templates/varnish6.vcl.jinja2
@@ -356,6 +356,7 @@ sub vcl_deliver {
  We can come here "invisibly" with the following errors: 413, 417 & 503
 */
 sub vcl_synth {
+    {{custom['vcl_synth']}}
     set resp.http.Content-Type = "text/html; charset=utf-8";
     set resp.http.Retry-After = "5";