diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index 6b75f0e72..655692fa1 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -44,7 +44,7 @@ A Guide to the Mazes of Menace
 (Guidebook for NetHack)
 .au
 Original version - Eric S. Raymond
-(Edited and expanded for 3.6 by Mike Stephenson and others)
+(Edited and expanded for 3.7 by Mike Stephenson and others)
 .sp 1
 \*(f2
 .hn 1
diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index cd1f29713..b91e2d78a 100644
--- a/doc/Guidebook.tex
+++ b/doc/Guidebook.tex
@@ -44,7 +44,7 @@
 
 %.au
 \author{Original version - Eric S. Raymond\\
-(Edited and expanded for 3.6 by Mike Stephenson and others)}
+(Edited and expanded for 3.7 by Mike Stephenson and others)}
 \date{February 10, 2020}
 
 \maketitle