diff -r 9e1de6fb9579 -r 1bbbaae6b5e3 src/Doc/Isar_Ref/document/root.tex
--- a/src/Doc/Isar_Ref/document/root.tex	Mon May 17 23:38:16 2021 +0200
+++ b/src/Doc/Isar_Ref/document/root.tex	Tue May 18 15:17:55 2021 +0200
@@ -23,7 +23,7 @@
 \hyphenation{Isar}
 
 \isadroptag{theory}
-\title{\includegraphics[scale=0.5]{isabelle_isar} \\[4ex] The Isabelle/Isar Reference Manual}
+\title{\includegraphics[scale=0.5]{isabelle_logo} \\[4ex] The Isabelle/Isar Reference Manual}
 \author{\emph{Makarius Wenzel} \\[3ex]
   With Contributions by
   Clemens Ballarin,