diff --git a/minimap2.1 b/minimap2.1
index 96ee539..c8311a5 100644
--- a/minimap2.1
+++ b/minimap2.1
@@ -161,8 +161,10 @@ and
 have no effect when this option is in use.
 .TP
 .BR --dual = yes | no
-During chaining, whether to skip pairs wherein the query name is
-lexicographically greater than the target name [yes]
+If
+.BR no ,
+skip query-target pairs wherein the query name is lexicographically greater
+than the target name [yes]
 .TP
 .B -X
 Equivalent to