diff -r 633d14bd1e59 -r 3d255ebe9733 src/HOL/ROOT
--- a/src/HOL/ROOT	Wed Oct 07 10:39:14 2020 +0200
+++ b/src/HOL/ROOT	Wed Oct 07 17:34:24 2020 +0200
@@ -282,6 +282,7 @@
     Trie_Fun
     Trie_Map
     Tries_Binary
+    Queue_2Lists
     Leftist_Heap
     Binomial_Heap
   document_files "root.tex" "root.bib"