diff -r 107472ccc60d -r 026de3424c39 src/Doc/ROOT
--- a/src/Doc/ROOT	Wed Jun 17 19:46:50 2020 +0200
+++ b/src/Doc/ROOT	Wed Jun 17 20:42:52 2020 +0200
@@ -378,7 +378,7 @@
     "root.tex"
 
 session System (doc) in "System" = Pure +
-  options [document_variants = "system", thy_output_source, pide_session]
+  options [document_variants = "system", thy_output_source]
   sessions
     "HOL-Library"
   theories