diff -r bd97236cbc02 -r 2a13c396201d src/Pure/Thy/html.ML
--- a/src/Pure/Thy/html.ML	Mon Oct 11 16:07:35 1999 +0200
+++ b/src/Pure/Thy/html.ML	Mon Oct 11 20:42:06 1999 +0200
@@ -222,7 +222,7 @@
     | encl (Some true) = I;
 
   fun file (opt_ref, path, loadit) = href_opt_path opt_ref (encl loadit (file_path path));
-  val files = space_implode " + " o map file;
+  val files = space_implode " " o map file;
   val parents = space_implode " + " o map (uncurry href_opt_path o apsnd name);
 
   fun theory up A =