update installation instructions, review feedback
diff --git a/INSTALL b/INSTALL
index b4a53bb..d183fce 100644
--- a/INSTALL
+++ b/INSTALL
@@ -11,15 +11,16 @@
 
 On Linux (Debian):
 
- Note: you will need to add the Debian 'unstable' distribution to your source
+ Note: you will need to add the Debian 'unstable' distribution to your sources
  file first.
 
  Add the following line to your `/etc/apt/sources.list` file:
 
- deb http://ftp.us.debian.org/debian unstable main contrib non-free
+   deb http://ftp.us.debian.org/debian unstable main contrib non-free
 
- Install the gRPC library
- $ sudo apt-get install libgrpc-dev
+ Install the gRPC library:
+
+ $ [sudo] apt-get install libgrpc-dev
 
 OR
 
@@ -27,21 +28,21 @@
  $ cd grpc
  $ git submodule update --init
  $ make 
- $ sudo make install
+ $ [sudo] make install
 
 You don't need anything else than GNU Make, gcc and autotools. Under a Debian
 or Ubuntu system, this should boil down to the following packages:
 
- $ apt-get install build-essential autoconf libtool
+ $ [sudo] apt-get install build-essential autoconf libtool
 
 Building the python wrapper requires the following:
 
- $ apt-get install python-all-dev python-virtualenv
+ $ [sudo] apt-get install python-all-dev python-virtualenv
 
 If you want to install in a different directory than the default /usr/lib, you can
 override it on the command line:
 
- $ make install prefix=/opt
+ $ [sudo] make install prefix=/opt
 
 
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