1 files changed, 1 insertions, 0 deletions
diff --git a/spec.txt b/spec.txt
index bec510d..5963821 100644
--- a/spec.txt
+++ b/spec.txt
@@ -4,6 +4,7 @@ author:
 - John MacFarlane
 version: 0.13
 date: 2014-12-10
+license: '[CC-BY-SA 4.0](http://creativecommons.org/licenses/by-sa/4.0/)'
 ...
 
 # Introduction