diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index 18461b585..ba99287ff 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -6803,7 +6803,7 @@ been released as version 4.0.
 NetHack 5.0.0 was released on , 2026.
 .pg
 The source code for NetHack 5.0.0 was modified and modernized to be
-compliant with standard C99. The 5.0.0 release contains over 3100 fixes,
+compliant with standard C99. The 5.0.0 release contained over 3100 fixes,
 changes, and updated features.
 .pg
 NetHack 5.0 was the first version to replace the lex and yacc level