diff --git a/doc/Guidebook.txt b/doc/Guidebook.txt
index ae19710a4..456ff45ae 100644
--- a/doc/Guidebook.txt
+++ b/doc/Guidebook.txt
@@ -7541,8 +7541,8 @@
           NetHack 5.0.0 was released on May 2, 2026.
 
           The  source code for NetHack 5.0.0 was modified and modernized to
-     be compliant with standard C99. The 5.0.0 release contained over  3100
-     fixes, changes, and updated features.
+     be compliant with the C99 standard. The 5.0.0 release  contained  over
+     3100 fixes, changes, and updated features.
 
           NetHack  5.0  was  the  first version to replace the lex and yacc
      level and dungeon compilers of past versions, with a  new  Lua  inter-