diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index afea69057..3859b4e68 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{April 27, 2018}
+\date{May 16, 2018}
 
 \maketitle