diff --git a/src/lang/en.json b/src/lang/en.json
index 5d10a28b6..f822120b1 100644
--- a/src/lang/en.json
+++ b/src/lang/en.json
@@ -1299,7 +1299,7 @@
     "domain_expiry_unsupported_missing_target": "No valid domain or hostname is configured for this monitor",
     "domain_expiry_unsupported_invalid_domain": "The configured value \"{hostname}\" is not a valid domain name",
     "domain_expiry_public_suffix_too_short": "\".{publicSuffix}\" is too short for a top level domain",
-    "domain_expiry_unsupported_is_icann": "The domain \"{domain}\" is not a candidate for domain expiry monitoring",
+    "domain_expiry_unsupported_is_icann": "The domain \"{domain}\" is not a candidate for domain expiry monitoring, because its public suffix \".{publicSuffix}\" is not ICAN",
     "domain_expiry_unsupported_is_ip": "\"{hostname}\" is an IP address. Domain expiry monitoring requires a domain name",
     "domain_expiry_unsupported_unsupported_tld_no_rdap_endpoint": "Domain expiry monitoring is not available for \".{publicSuffix}\" because no RDAP service is listed by IANA",
     "minimumIntervalWarning": "Intervals below 20 seconds may result in poor performance.",