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--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 Some s6 service definitions for third-party software on Slackware Linux.
 
+## application
+
+This directory contains an example of a Ruby on Rails service running on
+the default Puma server.
+
 ## busybox
 
 This directory contains scripts that can be used on embedded Linux systems