diff --git a/doc/ref.xml b/doc/ref.xml
index 3d3ad185..bbb77f40 100644
--- a/doc/ref.xml
+++ b/doc/ref.xml
@@ -439,7 +439,7 @@ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
                 <parameter name="k">
                   <paramtype>key_type const&amp;</paramtype>
                 </parameter>
-                <type>std::pair&lt;iterator, iterator&gt;</type>
+                <type>std::pair&lt;const_iterator, const_iterator&gt;</type>
               </signature>
               <returns>
                 <para>A range containing all elements with key equivalent to <code>k</code>.
@@ -576,10 +576,10 @@ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
                 </template-type-parameter>
               </template>
               <parameter name="x">
-                <paramtype>unordered_set&lt;Key, T, Hash, Pred, Alloc&gt;&amp;</paramtype>
+                <paramtype>unordered_set&lt;Value, Hash, Pred, Alloc&gt;&amp;</paramtype>
               </parameter>
               <parameter name="y">
-                <paramtype>unordered_set&lt;Key, T, Hash, Pred, Alloc&gt;&amp;</paramtype>
+                <paramtype>unordered_set&lt;Value, Hash, Pred, Alloc&gt;&amp;</paramtype>
               </parameter>
               <type>void</type>
               <effects>
@@ -1018,7 +1018,7 @@ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
                 <parameter name="k">
                   <paramtype>key_type const&amp;</paramtype>
                 </parameter>
-                <type>std::pair&lt;iterator, iterator&gt;</type>
+                <type>std::pair&lt;const_iterator, const_iterator&gt;</type>
               </signature>
               <returns>
                 <para>A range containing all elements with key equivalent to <code>k</code>.
@@ -1155,10 +1155,10 @@ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
                 </template-type-parameter>
               </template>
               <parameter name="x">
-                <paramtype>unordered_multiset&lt;Key, T, Hash, Pred, Alloc&gt;&amp;</paramtype>
+                <paramtype>unordered_multiset&lt;Value, Hash, Pred, Alloc&gt;&amp;</paramtype>
               </parameter>
               <parameter name="y">
-                <paramtype>unordered_multiset&lt;Key, T, Hash, Pred, Alloc&gt;&amp;</paramtype>
+                <paramtype>unordered_multiset&lt;Value, Hash, Pred, Alloc&gt;&amp;</paramtype>
               </parameter>
               <type>void</type>
               <effects>
@@ -1614,7 +1614,7 @@ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
                 <parameter name="k">
                   <paramtype>key_type const&amp;</paramtype>
                 </parameter>
-                <type>std::pair&lt;iterator, iterator&gt;</type>
+                <type>std::pair&lt;const_iterator, const_iterator&gt;</type>
               </signature>
               <returns>
                 <para>A range containing all elements with key equivalent to <code>k</code>.
@@ -2237,7 +2237,7 @@ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
                 <parameter name="k">
                   <paramtype>key_type const&amp;</paramtype>
                 </parameter>
-                <type>std::pair&lt;iterator, iterator&gt;</type>
+                <type>std::pair&lt;const_iterator, const_iterator&gt;</type>
               </signature>
               <returns>
                 <para>A range containing all elements with key equivalent to <code>k</code>.