diff --git a/include/boost/circular_buffer/base.hpp b/include/boost/circular_buffer/base.hpp
index 57f3941..c8544af 100644
--- a/include/boost/circular_buffer/base.hpp
+++ b/include/boost/circular_buffer/base.hpp
@@ -36,7 +36,14 @@ namespace boost {
     \class circular_buffer
     \brief Circular buffer - a STL compliant container.
     \param T The type of the elements stored in the circular buffer.
+	       <code>T</code> has to be <a href="http://www.sgi.com/tech/stl/Assignable.html">
+		   SGIAssignable</a> (SGI STL defined combination of <a href="../../utility/Assignable.html">
+		   Assignable</a> and <a href="../../utility/CopyConstructible.html">CopyConstructible</a>.
+		   Moreover <code>T</code> has to be <a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">
+		   DefaultConstructible</a> if supplied as a default parameter during invocation of some methods
+		   e.g. insert(iterator pos, const T& item = T()).
     \param Alloc The allocator type used for all internal memory management.
+	       The <code>Alloc</code> has to meet the allocator requirements imposed by STL.
            Default: std::allocator<T>
     \author Jan Gaspar
     \version 3.7