diff --git a/doc/README-7zip.txt b/doc/README-7zip.txt
index 07a4192..208601d 100644
--- a/doc/README-7zip.txt
+++ b/doc/README-7zip.txt
@@ -1,11 +1,18 @@
 - the 7zip version in CentOS does include all features.
   You can install the version from sf.net
 
+  # 32 bit  - binary package
   wget "https://sourceforge.net/projects/p7zip/files/p7zip/9.20.1/p7zip_9.20.1_x86_linux_bin.tar.bz2/download"
   tar xfvj p7zip_9.20.1_x86_linux_bin.tar.bz2 
   cd p7zip_9.20.1*
-
   sh install.sh
+
+  # 64bit - build from scratch
+  wget "http://downloads.sourceforge.net/project/p7zip/p7zip/9.20.1/p7zip_9.20.1_src_all.tar.bz2?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Fp7zip%2Ffiles%2Fp7zip%2F9.20.1%2F&ts=1328454155&use_mirror=kent"
+  yum install gcc-c++ 
+  make all_test
+  make install
+
   emacs -nw /etc/profile
           PATH=/usr/local/bin:$PATH
           export PATH