diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index 21c8e2639..6b75f0e72 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -24,7 +24,7 @@
 .ds vr "NetHack 3.7
 .ds f0 "\*(vr
 .ds f1
-.ds f2 "January 27, 2020
+.ds f2 "February 10, 2020
 .
 .\" A note on some special characters:
 .\" \(lq = left double quote
diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index ca25f2249..cd1f29713 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{January 27, 2020}
+\date{February 10, 2020}
 
 \maketitle