Fix grammar
diff --git a/docs/usermanual-clusters.xml b/docs/usermanual-clusters.xml
index de7d219..b8d9191 100644
--- a/docs/usermanual-clusters.xml
+++ b/docs/usermanual-clusters.xml
@@ -684,7 +684,7 @@
<para>
There may be other problems encountered with ligatures under
level 2, such as if the direction of the text is forced to
- opposite of its natural direction (for example, Arabic text
+ the opposite of its natural direction (for example, Arabic text
that is forced into left-to-right directionality). But,
generally speaking, these other scenarios are minor corner
cases that are too obscure for most client programs to need to
