Index: head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
===================================================================
--- head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
+++ head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
@@ -6957,10 +6957,10 @@
 	<para>Provides a way to add conflicts between options.</para>
 
 	<para>When <replaceable>OPT</replaceable> is selected, all the
-	  options listed in this variable must be un-selected.  If
-	  <varname><replaceable>OPT</replaceable>_PREVENTS_MSG</varname>
-	  is also selected, its content will be shown, explaining why
-	  they conflict.  For example:</para>
+	  options listed in <varname><replaceable>OPT</replaceable>_PREVENTS</varname>
+	  must be un-selected.  If <varname><replaceable>OPT</replaceable>_PREVENTS_MSG</varname>
+	  is set and a conflict is triggered, its content will be shown explaining
+	  why they conflict.  For example:</para>
 
 	<programlisting>OPTIONS_DEFINE=	OPT1 OPT2
 OPT1_PREVENTS=	OPT2