diff -r 0a574315af3e -r 4f746d8966dd app/views/issues/index.api.rsb
--- a/app/views/issues/index.api.rsb
+++ b/app/views/issues/index.api.rsb
@@ -23,6 +23,7 @@
 
       api.created_on issue.created_on
       api.updated_on issue.updated_on
+      api.closed_on  issue.closed_on
 
       api.array :relations do
         issue.relations.each do |relation|