diff --git a/whois/tldDb/tld_regexpr.py b/whois/tldDb/tld_regexpr.py
index 964337f..0883708 100644
--- a/whois/tldDb/tld_regexpr.py
+++ b/whois/tldDb/tld_regexpr.py
@@ -735,6 +735,8 @@ def xStr(what: str, times: int = 1, firstMandatory: bool = True) -> str:
     "registrar": R(r"\nREGISTRAR:\s*(.+)\n"),
     "creation_date": R(r"\ncreated:\s*(.+)\n"),
     "updated_date": R(r"\nlast modified:\s*(.+)\n"),
+    # If no "option expiration date:" is present, use "renewal date:", but only
+    # if it's not not followed by "option expiration date:".
     "expiration_date": R(r"(?:\noption expiration date:|renewal date:(?!(?:.|\n)*\noption expiration date:))\s*(.+)\n"),
     "name_servers": R(r"nameservers:%s" % xStr(r"(?:\s+(\S+)[^\n]*\n)?", 4)),
     "status": R(r"\nStatus:\n\s*(.+)"),