diff --git a/abi-eh.html b/abi-eh.html
index d7ad49f..b7e8d7f 100644
--- a/abi-eh.html
+++ b/abi-eh.html
@@ -2077,6 +2077,52 @@ <h5> 3.4.1  Allocating the Exception Object </h5>
      its buffers before acquiring one.
 </ul>
 
+<p>
+<a name=imp-initialize></a>
+<h5> 3.4.2  Initializing the Exception Object</h5>
+
+<p>
+Vaguely, the process of throwing an exception consists of
+three independent parts:
+<ol>
+<li> Allocate the memory for the exception and copy user object into that memory
+<li> Set up the internal fields of the exception object
+<li> Start unwinding process
+</ol>
+
+<p>
+Sometimes it's desirable to do p.1 and p.2 with leaving p.3 for later: this is what
+<code>std::exception_ptr</code> does.<br>
+To better support such use cases implementors of the ABI are encouraged to provide a
+<code>__cxa_init_primary_exception</code> function, which implements p.2.<br>
+<code><pre>
+    void* __cxa_init_primary_exception (void *thrown_exception, std::type_info *tinfo, void (*dest) (void *) );
+</pre></code>
+
+The arguments are:
+<ul>
+<p>
+<li> The address of the thrown exception object
+     (which points to the throw value, after the header,
+     as specified above).
+<p>
+<li> A <code>std::type_info</code> pointer,
+     giving the static type of the throw argument
+     as a <code>std::type_info</code> pointer,
+     used for matching potential catch sites to the thrown exception.
+<p>
+<li> A destructor pointer to be used eventually to destroy the object.
+</ul>
+
+Noticing the similarities of parameters of this function and <code>__cxa_throw</code>,<br>
+<code>__cxa_init_primary_exception</code> is expected to be used as a subroutine of <code>__cxa_throw</code>.
+
+<p>
+<i>
+Collaboration between <code>__cxa_init_primary_exception()</code> and
+whichever way <code>std::rethrow_exception</code> is implemented is necessary to handle the p.3 (deferred unwinding).
+</i>
+
 
 <p>
 <a name=imp-catch></a>