diff --git a/velox/functions/lib/DateTimeFormatter.cpp b/velox/functions/lib/DateTimeFormatter.cpp
index afa281bd361e5..9a71c5a2f765e 100644
--- a/velox/functions/lib/DateTimeFormatter.cpp
+++ b/velox/functions/lib/DateTimeFormatter.cpp
@@ -1334,7 +1334,7 @@ int32_t DateTimeFormatter::format(
               static_cast<int>(calDate.year()),
               static_cast<uint32_t>(calDate.month()),
               static_cast<uint32_t>(calDate.day()),
-              2, // (ISO 9601) Monday = 2
+              2, // (ISO 8601) Monday = 2
               4 // At least 4 days in first week
           );