etc/options

--- a/etc/options	Tue Dec 12 17:47:23 2017 +0100
+++ b/etc/options	Tue Dec 12 17:46:22 2017 +0100
@@ -13,6 +13,8 @@
   -- "alternative document variants (separated by colons)"
 option document_tags : string = ""
   -- "default command tags (separated by commas)"
+option document_positions : bool = true
+  -- "inline original source positions into generated tex files"
 
 option thy_output_display : bool = false
   -- "indicate output as multi-line display-style material"