diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index 30c7e9dbc..49a854c07 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -21,7 +21,7 @@
 .ds vr "NetHack 3.6
 .ds f0 "\*(vr
 .ds f1
-.ds f2 "May 16, 2018
+.ds f2 "May 28, 2018
 .
 .\" labeled paragraph start (should be part of tmac.n, but I don't want to
 .\" make changes to that file)
diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index 048c81021..e9a805e25 100644
--- a/doc/Guidebook.tex
+++ b/doc/Guidebook.tex
@@ -45,7 +45,7 @@
 %.au
 \author{Original version - Eric S. Raymond\\
 (Edited and expanded for 3.6 by Mike Stephenson and others)}
-\date{May 16, 2018}
+\date{May 28, 2018}
 
 \maketitle