From a85d8335767b8acad7de36a16be1c6ae4bca9aff Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sun, 25 Jun 2017 15:52:30 +0200
Subject: [PATCH] Fixed log message for InvalidLang.

---
 src/Text/Pandoc/Logging.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Text/Pandoc/Logging.hs b/src/Text/Pandoc/Logging.hs
index ad0fcdd2d..e31fb1521 100644
--- a/src/Text/Pandoc/Logging.hs
+++ b/src/Text/Pandoc/Logging.hs
@@ -259,7 +259,7 @@ showLogMessage msg =
          "It is recommended that lang be specified for this format."
        InvalidLang s ->
          "Invalid 'lang' value '" ++ s ++ "'.\n" ++
-         "Use ISO 8601 format like 'en-US'."
+         "Use an IETF language tag like 'en-US'."
        CouldNotHighlight m ->
          "Could not highlight code block:\n" ++ m
        MissingCharacter m ->