a reassuring note

playbooks/edx-east/mongo_rolling_upgrade.yml

@@ -125,7 +125,7 @@
   vars_files:
     - ../roles/mongo_3_0/defaults/main.yml
   tasks:
-    - name: Step down
+    - name: Step down (this can take up to a minute to complete while the primary waits on a secondary)
       mongodb_step_down:
         host: "{{ ansible_default_ipv4['address'] }}"
         username: "{{ MONGO_ADMIN_USER }}"