diff --git a/runtime/doc/xxd.1 b/runtime/doc/xxd.1
index 9ae132b..e52ef88 100644
--- a/runtime/doc/xxd.1
+++ b/runtime/doc/xxd.1
@@ -135,9 +135,9 @@
 particular column layout. Additional whitespace and line breaks are allowed
 anywhere.
 .TP
-.IR \-R " "[WHEN]
+.IR \-R " " when
 In output the hex-value and the value are both colored with the same color depending on the hex-value. Mostly helping to differentiate printable and non-printable characters.
-.I WHEN
+.I \fIwhen\fP
 is
 .BR never ", " always ", or " auto .
 .TP