diff --git a/.travis.yml b/.travis.yml
index 2ac840bc1..eec8aed57 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,7 @@ rvm:
 matrix:
   allow_failures:
     # SCM tests fail randomly due to IO.popen().
+    # http://www.redmine.org/issues/19091
     # https://github.com/jruby/jruby/issues/779
     - rvm: jruby
 env: