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-rw-r--r--doc/source/admin/drivers/zuul.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/source/admin/drivers/zuul.rst b/doc/source/admin/drivers/zuul.rst
index d95dffc9e..41535ee06 100644
--- a/doc/source/admin/drivers/zuul.rst
+++ b/doc/source/admin/drivers/zuul.rst
@@ -26,6 +26,12 @@ can simply be used by listing ``zuul`` as the trigger.
When Zuul merges a change to a project, it generates this
event for every open change in the project.
+ .. warning::
+
+ Triggering on this event can cause poor performance when
+ using the GitHub driver with a large number of
+ installations.
+
.. value:: parent-change-enqueued
When Zuul enqueues a change into any pipeline, it generates