diff --git a/htdocs/langs/en_US/main.lang b/htdocs/langs/en_US/main.lang
index 8a297b6adce..6b5f0574d13 100644
--- a/htdocs/langs/en_US/main.lang
+++ b/htdocs/langs/en_US/main.lang
@@ -1,6 +1,12 @@
-# Dolibarr language file - en_US - main
+# Dolibarr language file - Source file is en_US - main
 CHARSET=UTF-8
 DIRECTION=ltr
+# Note for chinese:
+# msungstdlight or cid0ct are for traditionnal chinese (traditionnal does not render with ubuntu pdf reader) 
+# stsongstdlight or cid0cs are for simplified chinese
+# To read chinese pdf with linux: sudo apt-get install poppler-data
+FONTFORPDF=helvetica
+FONTSIZEFORPDF=10
 SeparatorDecimal=.
 SeparatorThousand=,
 FormatDateShort=%m/%d/%Y