diff --git a/doc/27_ref_optional_synopsis.qbk b/doc/27_ref_optional_synopsis.qbk
index 9af4d76..9be5846 100644
--- a/doc/27_ref_optional_synopsis.qbk
+++ b/doc/27_ref_optional_synopsis.qbk
@@ -102,7 +102,7 @@
 
     }
 
-Classes `in_place_init_t` and `in_place_init_if_t` are empty clsses. Their purpose is to control overload resolution in the initialization of optional objects.
+Classes `in_place_init_t` and `in_place_init_if_t` are empty classes. Their purpose is to control overload resolution in the initialization of optional objects.
 They are empty, trivially copyable classes with disabled default constructor.
 
 [endsect]
diff --git a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_in_place_init.html b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_in_place_init.html
index 5084164..ca73fd9 100644
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_in_place_init.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_in_place_init.html
@@ -40,7 +40,7 @@
 <p>
           Classes <code class="computeroutput"><span class="identifier">in_place_init_t</span></code>
           and <code class="computeroutput"><span class="identifier">in_place_init_if_t</span></code>
-          are empty clsses. Their purpose is to control overload resolution in the
+          are empty classes. Their purpose is to control overload resolution in the
           initialization of optional objects. They are empty, trivially copyable
           classes with disabled default constructor.
         </p>