diff --git a/doc/lambda.xml b/doc/lambda.xml
index fbfeb52..21ffcfa 100644
--- a/doc/lambda.xml
+++ b/doc/lambda.xml
@@ -44,7 +44,7 @@
     <para>
 
       The Boost Lambda Library (BLL in the sequel) is a C++ template
-      library, which implements a form of <emphasis>lambda abstractions</emphasis> for C++.
+      library, which implements form of <emphasis>lambda abstractions</emphasis> for C++.
 The term originates from functional programming and lambda calculus, where a lambda abstraction defines an unnamed function.
       The primary motivation for the BLL is to provide flexible and
       convenient means to define unnamed function objects for STL algorithms.
@@ -3191,7 +3191,7 @@ to extend the library with new features.
 
 
 
-<section>
+<appendix>
 <title>Rationale for some of the design decisions</title>
 
 <section id="lambda.why_weak_arity">
@@ -3256,7 +3256,7 @@ was dropped.
 
 </section>
 
-</section>
+</appendix>