diff -r cb0882cf150d -r 79122bdd4404 src/HOL/Library/Sum_of_Squares/sos_wrapper.ML
--- a/src/HOL/Library/Sum_of_Squares/sos_wrapper.ML	Fri Jul 15 15:19:12 2016 +0200
+++ b/src/HOL/Library/Sum_of_Squares/sos_wrapper.ML	Fri Jul 15 22:11:54 2016 +0200
@@ -60,7 +60,8 @@
 fun print_cert cert =
   Output.information
     ("To repeat this proof with a certificate use this command:\n" ^
-      Active.sendback_markup [] ("by (sos \"" ^ Positivstellensatz_Tools.print_cert cert ^ "\")"))
+      Active.sendback_markup [Markup.padding_command]
+        ("by (sos \"" ^ Positivstellensatz_Tools.print_cert cert ^ "\")"))
 
 fun sos_tac ctxt NONE =
       Sum_of_Squares.sos_tac print_cert