Linux.md in pgdexter-0.3.3

- old
+ new

@@ -2,10 +2,11 @@
 
 Distributions
 
 - [Ubuntu 16.04 (Xenial)](#ubuntu-1604-xenial)
 - [Ubuntu 14.04 (Trusty)](#ubuntu-1404-trusty)
+- [Debian 9 (Stretch)](#debian-9-stretch)
 - [Debian 8 (Jesse)](#debian-8-jesse)
 - [CentOS / RHEL 7](#centos--rhel-7)
 - [SUSE Linux Enterprise Server 12](#suse-linux-enterprise-server-12)
 
 ### Ubuntu 16.04 (Xenial)
@@ -22,9 +23,19 @@
 
 ```sh
 wget -qO- https://dl.packager.io/srv/pghero/dexter/key | sudo apt-key add -
 sudo wget -O /etc/apt/sources.list.d/dexter.list \
   https://dl.packager.io/srv/pghero/dexter/master/installer/ubuntu/14.04.repo
+sudo apt-get update
+sudo apt-get install dexter
+```
+
+### Debian 9 (Stretch)
+
+```sh
+wget -qO- https://dl.packager.io/srv/pghero/dexter/key | sudo apt-key add -
+sudo wget -O /etc/apt/sources.list.d/dexter.list \
+  https://dl.packager.io/srv/pghero/dexter/master/installer/debian/9.repo
 sudo apt-get update
 sudo apt-get install dexter
 ```
 
 ### Debian 8 (Jesse)