Update index.md

Author: courtneyga

src/connections/sources/catalog/cloud-apps/sendgrid/index.md

@@ -91,3 +91,5 @@ If you're getting an "Invalid Credentials" error when setting up the SendGrid so
 Make sure you allowlist Segment IP addresses on SendGrid. [Contact Segment](https://segment.com/help/contact/){:target="_blank”} for the list of IP addresses to allowlist.
 
 When you disable your SendGrid source, you'll need to also disable the webhook portion of your configuration.
+
+If you are only able to create one webhook, please review your SendGrid account plan details [here](https://sendgrid.com/en-us/pricing). On the free plan with SendGrid and can only have 1 webhook.