Document task priority tie breaking
@@ -57,3 +57,7 @@ Dask uses the following priorities, in order:
call) Dask orders tasks in such a way as to minimize the memory-footprint
of the computation. This is discussed in more depth in the
`task ordering documentation <https://github.com/dask/dask/blob/master/dask/order.py>`_.
+
+If multiple tasks each have exactly the same priorities outlined above, then
+the order in which tasks arrive at a worker, in a last in first out manner,
+is used to determine the order in which tasks run.
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