diff -r 1368cfa92b7a -r f2384ad1dff4 etc/options
--- a/etc/options	Tue Dec 05 14:03:10 2017 +0100
+++ b/etc/options	Tue Dec 05 15:19:32 2017 +0100
@@ -10,7 +10,7 @@
 option document_output : string = ""
   -- "document output directory (default within $ISABELLE_BROWSER_INFO tree)"
 option document_variants : string = "document"
-  -- "option alternative document variants (separated by colons)"
+  -- "alternative document variants (separated by colons)"
 
 option thy_output_display : bool = false
   -- "indicate output as multi-line display-style material"