diff --git a/docs/upgrade.rst b/docs/upgrade.rst
--- a/docs/upgrade.rst
+++ b/docs/upgrade.rst
@@ -47,6 +47,9 @@ This will upgrade the schema and update 
 and will always recheck the settings of the application, if there are no new 
 options that need to be set.
 
+.. note::
+   If you're using Celery, make sure you restart all instances of it after
+   upgrade.
 
 .. _virtualenv: http://pypi.python.org/pypi/virtualenv  
 .. _python: http://www.python.org/