diff --git a/.github/actions/spell-check/patterns.txt b/.github/actions/spell-check/patterns.txt
index a8fe9d70c031..690dc47b263b 100644
--- a/.github/actions/spell-check/patterns.txt
+++ b/.github/actions/spell-check/patterns.txt
@@ -23,6 +23,9 @@ msdn\.microsoft\.com/(?:[^/]+/|)library/\S*\.aspx?
 \b[0-9A-F]{8,}\b
 \bcommit [0-9a-f]+\b
 
+# HMAC
+hmac-sha512(:\w+|\.|)\s+[-a-zA-Z=;:/0-9+]*
+
 addNSECRecordToLW.*DNSName.*powerdnt.com.*QType::NS.*res->d_records
 data:[a-zA-Z=;,/0-9+]+
 BOOST_CHECK_EQUAL\(b64, "[a-zA-Z=;,/0-9+]+"