diff --git a/doc/28_ref_optional_semantics.qbk b/doc/28_ref_optional_semantics.qbk
index 8c4fd97..cb3d8c6 100644
--- a/doc/28_ref_optional_semantics.qbk
+++ b/doc/28_ref_optional_semantics.qbk
@@ -1386,7 +1386,7 @@ __SPACE__
 [#reference_swap_optional_reference]
 [: `void swap ( optional<T&>& x, optional<T&>& y ) noexcept ;`]
 
-* [*Postconditions:] `x` refers to what `y` refererred to before the swap (if anything). `y` refers to whatever `x` referred to before the swap.
+* [*Postconditions:] `x` refers to what `y` referred to before the swap (if anything). `y` refers to whatever `x` referred to before the swap.
 
 * [*Example:]
 ``
diff --git a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics.html b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics.html
index e893e19..780f6f3 100644
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics.html
@@ -2380,7 +2380,7 @@
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem">
               <span class="bold"><strong>Postconditions:</strong></span> <code class="computeroutput"><span class="identifier">x</span></code>
-              refers to what <code class="computeroutput"><span class="identifier">y</span></code> refererred
+              refers to what <code class="computeroutput"><span class="identifier">y</span></code> referred
               to before the swap (if anything). <code class="computeroutput"><span class="identifier">y</span></code>
               refers to whatever <code class="computeroutput"><span class="identifier">x</span></code>
               referred to before the swap.
diff --git a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics____free_functions.html b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics____free_functions.html
index 768d690..b3c6401 100644
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics____free_functions.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics____free_functions.html
@@ -404,7 +404,7 @@
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem">
               <span class="bold"><strong>Postconditions:</strong></span> <code class="computeroutput"><span class="identifier">x</span></code>
-              refers to what <code class="computeroutput"><span class="identifier">y</span></code> refererred
+              refers to what <code class="computeroutput"><span class="identifier">y</span></code> referred
               to before the swap (if anything). <code class="computeroutput"><span class="identifier">y</span></code>
               refers to whatever <code class="computeroutput"><span class="identifier">x</span></code>
               referred to before the swap.
diff --git a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___free_functions.html b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___free_functions.html
index e1f7d4e..776cffb 100644
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___free_functions.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___free_functions.html
@@ -479,7 +479,7 @@
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem">
               <span class="bold"><strong>Postconditions:</strong></span> <code class="computeroutput"><span class="identifier">x</span></code>
-              refers to what <code class="computeroutput"><span class="identifier">y</span></code> refererred
+              refers to what <code class="computeroutput"><span class="identifier">y</span></code> referred
               to before the swap (if anything). <code class="computeroutput"><span class="identifier">y</span></code>
               refers to whatever <code class="computeroutput"><span class="identifier">x</span></code>
               referred to before the swap.