diff --git a/docs/LangRef.html b/docs/LangRef.html
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--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -464,6 +464,19 @@ the future:</p>
   prototype and implemented declaration of the function (as does normal C).
   </dd>
 
+  <dt><b>"<tt>csretcc</tt>" - The C struct return calling convention</b>:</dt>
+
+  <dd>This calling convention matches the target C calling conventions, except
+  that functions with this convention are required to take a pointer as their
+  first argument, and the return type of the function must be void.  This is
+  used for C functions that return aggregates by-value.  In this case, the
+  function has been transformed to take a pointer to the struct as the first
+  argument to the function.  For targets where the ABI specifies specific
+  behavior for structure-return calls, the calling convention can be used to
+  distinguish between struct return functions and other functions that take a
+  pointer to a struct as the first argument.
+  </dd>
+
   <dt><b>"<tt>fastcc</tt>" - The fast calling convention</b>:</dt>
 
   <dd>This calling convention attempts to make calls as fast as possible