diff --git a/doc/coding_style.dox b/doc/coding_style.dox
--- a/doc/coding_style.dox
+++ b/doc/coding_style.dox
@@ -38,7 +38,7 @@
 
 
 \warning In some cases we diverge from these rules.
-This primary done because STL uses different naming convention and
+This is primary done because STL uses different naming convention and
 in certain cases
 it is beneficial to provide STL compatible interface.
 
@@ -95,6 +95,14 @@
 all_lower_case_with_underscores 
 \endcode
 
+\subsection pri-loc-var Private member variables
+
+Private member variables should start with underscore
+
+\code
+_start_with_underscores
+\endcode
+
 \subsection cs-excep Exceptions
 
 When writing exceptions please comply the following naming conventions.
diff --git a/doc/groups.dox b/doc/groups.dox
--- a/doc/groups.dox
+++ b/doc/groups.dox
@@ -568,8 +568,8 @@
 Some demo programs are listed here. Their full source codes can be found in
 the \c demo subdirectory of the source tree.
 
-The standard compilation procedure (<tt>./configure;make</tt>) will compile
-them, as well. 
+It order to compile them, use <tt>--enable-demo</tt> configure option when
+build the library.
 
 */