diff --git a/README.md b/README.md
index e84465f..6319ef0 100644
--- a/README.md
+++ b/README.md
@@ -16,4 +16,6 @@ To use the scripts for a new domain renewal, use the "manual" plugin with the ex
 
 This example requests a wildcard certificate for the domain `yourdomain.com` - change accordingly.
 
-`certbot certonly --manual -d *.yourdomain.com -d yourdomain.com --preferred-challenges dns-01 --manual-auth-hook /path/to/linode-auth-hook.sh --manual-cleanup-hook /path/to/linode-cleanup-hook.sh`.
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+`certbot certonly --manual -d *.yourdomain.com -d yourdomain.com --preferred-challenges dns-01 --manual-auth-hook /path/to/linode-auth-hook.sh --manual-cleanup-hook /path/to/linode-cleanup-hook.sh`.
+
+**Please note:** Linode only deploy changes to their nameservers roughly every 15 minutes, so DNS records do not show up immediately. The authorisation script waits for 20 minutes after creating a record before exiting to allow the DNS records to be deployed before Let's Encrypt verifies them. Therefore this script can take some time to run. Once a certificate has been issued, renewals happen non-interactively.
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