diff --git a/implementation.htm b/implementation.htm
index 008fbed..66af1fe 100644
--- a/implementation.htm
+++ b/implementation.htm
@@ -27,7 +27,7 @@
   <p><font color="red">This documentation is out-of-date; similar but
   newer implementation techniques are now used.  This documentation
   also refers to components and protocols in the library's old
-  interace such as <code>BOOST_CLASS_REQUIRES</code>
+  interface such as <code>BOOST_CLASS_REQUIRES</code>
   and <code>constraints()</code> functions, which are still supported
   but deprecated.</font></p>
 
@@ -77,7 +77,7 @@
   function. Instead, we group sets of valid expressions together, according
   to the definitions of the corresponding concepts. For each concept we
   define a concept checking class template where the template parameter is
-  for the type to be checked. The class contains a <tt>contraints()</tt>
+  for the type to be checked. The class contains a <tt>constraints()</tt>
   member function which exercises all of the valid expressions of the
   concept. The objects used in the constraints function, such as <tt>n</tt>
   and <tt>i</tt>, are declared as data members of the concept checking
diff --git a/include/boost/concept_check.hpp b/include/boost/concept_check.hpp
index 660516f..abbadb7 100644
--- a/include/boost/concept_check.hpp
+++ b/include/boost/concept_check.hpp
@@ -335,8 +335,8 @@ namespace boost
 
 #if (BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(4) \
                       && BOOST_WORKAROUND(__GNUC__, > 3)))
-      // Declare a dummy construktor to make gcc happy.
-      // It seems the compiler can not generate a sensible constructor when this is instantiated with a refence type.
+      // Declare a dummy constructor to make gcc happy.
+      // It seems the compiler can not generate a sensible constructor when this is instantiated with a reference type.
       // (warning: non-static reference "const double& boost::UnaryFunction<YourClassHere>::arg"
       // in class without a constructor [-Wuninitialized])
       UnaryFunction();
@@ -365,7 +365,7 @@ namespace boost
 #if (BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(4) \
                       && BOOST_WORKAROUND(__GNUC__, > 3)))
       // Declare a dummy constructor to make gcc happy.
-      // It seems the compiler can not generate a sensible constructor when this is instantiated with a refence type.
+      // It seems the compiler can not generate a sensible constructor when this is instantiated with a reference type.
       // (warning: non-static reference "const double& boost::BinaryFunction<YourClassHere>::arg"
       // in class without a constructor [-Wuninitialized])
       BinaryFunction();
@@ -385,7 +385,7 @@ namespace boost
 #if (BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(4) \
                       && BOOST_WORKAROUND(__GNUC__, > 3)))
       // Declare a dummy constructor to make gcc happy.
-      // It seems the compiler can not generate a sensible constructor when this is instantiated with a refence type.
+      // It seems the compiler can not generate a sensible constructor when this is instantiated with a reference type.
       // (warning: non-static reference "const double& boost::UnaryPredicate<YourClassHere>::arg"
       // in class without a constructor [-Wuninitialized])
       UnaryPredicate();
@@ -404,7 +404,7 @@ namespace boost
 #if (BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(4) \
                       && BOOST_WORKAROUND(__GNUC__, > 3)))
       // Declare a dummy constructor to make gcc happy.
-      // It seems the compiler can not generate a sensible constructor when this is instantiated with a refence type.
+      // It seems the compiler can not generate a sensible constructor when this is instantiated with a reference type.
       // (warning: non-static reference "const double& boost::BinaryPredicate<YourClassHere>::arg"
       // in class without a constructor [-Wuninitialized])
       BinaryPredicate();
@@ -429,7 +429,7 @@ namespace boost
 #if (BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(4) \
                       && BOOST_WORKAROUND(__GNUC__, > 3)))
       // Declare a dummy constructor to make gcc happy.
-      // It seems the compiler can not generate a sensible constructor when this is instantiated with a refence type.
+      // It seems the compiler can not generate a sensible constructor when this is instantiated with a reference type.
       // (warning: non-static reference "const double& boost::Const_BinaryPredicate<YourClassHere>::arg"
       // in class without a constructor [-Wuninitialized])
       Const_BinaryPredicate();