Added warning about VCL snippet format

meker12 · meker12 · commit 2d0ddc0110f7 · 2019-12-16T11:47:13.000-06:00
-  Warned customers that custom VCL snippet example is formatted as a JSON payload for use in Fastly API requests
-  Indicated that special characters in VCL code snippet must be escaped when submitting snippets from the Magento Admin UI
diff --git a/src/cloud/cdn/cloud-vcl-custom-snippets.md b/src/cloud/cdn/cloud-vcl-custom-snippets.md
@@ -45,7 +45,7 @@ You can create and manage custom VCL snippets from the Magento Admin UI or by us
 
 ### Example VCL snippet code {#vcl-curl}
 
-The following example shows the JSON code for a custom VCL snippet that filters traffic by client IP address.
+The following example shows the custom VCL snippet that filters traffic by client IP address in JSON format.
 
 ```json
 {
@@ -59,9 +59,16 @@ The following example shows the JSON code for a custom VCL snippet that filters
 }
 ```
 
+{: .bs-callout-warning}
+In this example, the VCL code is formatted as a JSON payload that can be saved to a file and submitted in a Fastly API request. If you submit the VCL code snippet from the Magento Admin UI, or as a JSON string using the Fastly API, you must escape special characters to prevent validation errors. See the example in [Secure the Magento Admin UI]({{ site.baseurl }}/cloud/cdn/fastly-vcl-whitelist.html#vcl) topic.
+
 The VCL logic in the `content` field performs the following actions:
 
--  Checks the incoming IP address, `client.ip` on each request
+- Checks the incoming IP address, `client.ip` on each request
+
+- Blocks any request with an IP address included in the *ACLNAME* edge ACL, returning a `403 Forbidden` error
+
+The following table provides details about key data for custom VCL snippets.  For a more detailed reference, see the [VCL snippets](https://docs.fastly.com/api/config#api-section-snippet) reference in the Fastly documentation.
 
 -  Blocks any request with an IP address included in the *ACLNAME* edge ACL, returning a `403 Forbidden` error
 
