Link to SC blog post from introduction section.

content/docs/introduction/overview.md

@@ -12,6 +12,9 @@ monitoring and alerting toolkit built at [SoundCloud](http://soundcloud.com).
 Since its inception in 2012, it has become the standard for instrumenting new
 services at SoundCloud and is seeing growing external usage and contributions.
 
+For a more elaborate overview, see also [SoundCloud's blog post which announces
+Prometheus](https://developers.soundcloud.com/blog/prometheus-monitoring-at-soundcloud).
+
 ### Features
 
 Prometheus's main features are: