README.md in trema-0.2.2 vs README.md in trema-0.2.2.1

@@ -16,14 +16,14 @@
 ---------------
 
 Trema requires several third-party software. You can install the
 prerequisites as follows:
 
-  $ sudo apt-get install gcc make ruby ruby-dev irb file libpcap-dev libsqlite3-dev
+    $ sudo apt-get install gcc make ruby ruby-dev irb file libpcap-dev libsqlite3-dev
 
 Download Trema source tree then run its build script:
 
-  $ ./build.rb
+    $ ./build.rb
 
 NOTE: Trema has been tested ONLY on the following environments:
 
 * Ubuntu 11.10 (i386/amd64, Desktop Edition)
 * Ubuntu 11.04 (i386/amd64, Desktop Edition)