diff --git a/string/doc/usage.xml b/string/doc/usage.xml
index 2dafad4..3b7e220 100644
--- a/string/doc/usage.xml
+++ b/string/doc/usage.xml
@@ -57,7 +57,7 @@
The magic of Boost.Range
provides a uniform way of handling different string types.
If there is a need to pass a pair of iterators,
- boost::iterator_range
+ boost::iterator_range
can be used to package iterators into a structure with a compatible interface.