diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index e74f2f81d..62a7ef492 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -6852,7 +6852,7 @@ work with the msdos port and keep it alive.  Cross-compiling the MS-DOS
 port has helped make that possible and mostly painless.
 .pg
 People that contributed to the Windows port of NetHack 5.0 since the
-development of NetHack 5.0 begain over eleven years ago, included
+development of NetHack 5.0 began over eleven years ago, included
 \fBMichael Allison\fP, \fBDavid Cohrs\fP, \fBBart House\fP,
 \fBPasi Kallinen\fP, \fBAlex Kompel\fP, \fBDion Nicolaas\fP,
 \fBDerek S. Ray\fP and \fBYitzhak Sapir\fP.
diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index 2302522aa..6f129f090 100644
--- a/doc/Guidebook.tex
+++ b/doc/Guidebook.tex
@@ -7623,7 +7623,7 @@ port has helped make that possible and mostly painless.
 %.pg
 \medskip
 People that contributed to the Windows port of \textit{NetHack} 5.0 since the
-development of \textit{NetHack} 5.0 begain over eleven years ago, included
+development of \textit{NetHack} 5.0 began over eleven years ago, included
 \textit{Michael Allison}, \textit{David Cohrs}, \textit{Bart House},
 \textit{Pasi Kallinen}, \textit{Alex Kompel}, \textit{Dion Nicolaas},
 \textit{Derek S. Ray} and \textit{Yitzhak Sapir}.