update unicorn holdings example

diff --git a/examples/unicorn_999.map b/examples/unicorn_999.map
index b0e67c6..fe8e18d 100644 (file)
--- a/examples/unicorn_999.map
+++ b/examples/unicorn_999.map
@@ -1,4 +1,5 @@
 call_number       999 a
+volume_info       999 v
 copy_number       999 c
 last_activity     999 d
 last_charged      999 e