diff -r d9a54c4c9da9 -r 3cc73d00553c src/Pure/Thy/presentation.scala
--- a/src/Pure/Thy/presentation.scala	Sat Nov 28 20:18:29 2020 +0100
+++ b/src/Pure/Thy/presentation.scala	Sat Nov 28 21:56:24 2020 +0100
@@ -612,7 +612,7 @@
   /* Isabelle tool wrapper */
 
   val isabelle_tool =
-    Isabelle_Tool("document", "prepare session theory document", args =>
+    Isabelle_Tool("document", "prepare session theory document", Scala_Project.here, args =>
     {
       var output_sources: Option[Path] = None
       var output_pdf: Option[Path] = None