diff --git a/doc/man-ptel.but b/doc/man-ptel.but
index 07a756b1..4101c867 100644
--- a/doc/man-ptel.but
+++ b/doc/man-ptel.but
@@ -31,6 +31,7 @@ Sorry.)
 \dt \cw{\-fn} \e{font-name}
 
 \dd Specify the font to use for normal text displayed in the terminal.
+For example, \cw{\-fn\_fixed}, \cw{\-fn\_"Monospace\_12"}.
 
 \dt \cw{\-fb} \e{font-name}
 
diff --git a/doc/man-pter.but b/doc/man-pter.but
index 26d5842d..fec97f11 100644
--- a/doc/man-pter.but
+++ b/doc/man-pter.but
@@ -51,6 +51,7 @@ sets of defaults and choose between them.
 \dt \cw{\-fn} \e{font-name}
 
 \dd Specify the font to use for normal text displayed in the terminal.
+For example, \cw{\-fn\_fixed}, \cw{\-fn\_"Monospace\_12"}.
 
 \dt \cw{\-fb} \e{font-name}
 
diff --git a/doc/man-putt.but b/doc/man-putt.but
index 72094495..708bae7f 100644
--- a/doc/man-putt.but
+++ b/doc/man-putt.but
@@ -30,6 +30,7 @@ Sorry.)
 \dt \cw{\-fn} \e{font-name}
 
 \dd Specify the font to use for normal text displayed in the terminal.
+For example, \cw{\-fn\_fixed}, \cw{\-fn\_"Monospace\_12"}.
 
 \dt \cw{\-fb} \e{font-name}