diff --git a/lib/encodings b/lib/encodings
index c79db405be..75ae8f3d0d 100644
--- a/lib/encodings
+++ b/lib/encodings
@@ -59,6 +59,7 @@ End
 Encoding iso8859-6 8859-6 "Arabic (ISO 8859-6)" ISO-8859-6 fixed inputenc
 End
 
+# Not standard, see http://ctan.org/tex-archive/language/greek/greek-inputenc
 Encoding iso8859-7 iso-8859-7 "Greek (ISO 8859-7)" ISO-8859-7 fixed inputenc
 End