diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index 5998097dc..aab099ded 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -4384,7 +4384,7 @@ Effectively a superset of the
 .op hilite_pet
 boolean option.
 Curses or tty interface only; value is one of
-none, bold, dim, underline, blink, and inverse.
+none, bold, dim, underline, italic, blink, and inverse.
 Some of those choices might not work,
 depending upon terminal hardware or terminal emulation software.
 .lp ""
diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index a8eb639d4..4e306b4c1 100644
--- a/doc/Guidebook.tex
+++ b/doc/Guidebook.tex
@@ -4802,7 +4802,7 @@ Specifies one or more text highlighting attributes to use when showing
 pets on the map.
 Effectively a superset of the {\it hilite\verb+_+pet\/} boolean option.
 Curses or tty interface only; value is one of
-none, bold, dim, underline, blink, and inverse.
+none, bold, dim, underline, italic, blink, and inverse.
 Some of those choices might not work,
 depending upon terminal hardware or terminal emulation software.