add logger, provide loop factory rather than default loop policy

1 files changed, 1 insertions, 1 deletions

diff --git a/nemesis/nemesis.py b/nemesis/nemesis.py
index 7eed743..6d2941c 100755
--- a/nemesis/nemesis.py
+++ b/nemesis/nemesis.py
@@ -128,7 +128,7 @@ class Nemesis(object):
         loops = Nemesis._get_event_loops()
         for loop in loops:
             if not isinstance(loop, CausalEventLoop):
-                raise RuntimeError("Nemesis requires a custom event loop to insert slowdowns. It does not work on programs which change the event loop policy.")
+                raise RuntimeError(f"Nemesis requires a custom event loop to insert slowdowns. You must start the event loop with `asyncio.run(your_coro(), loop_factory=causal_loop_factory)'.")
             loop.set_speedup(speedup)
 
         Nemesis.experiment_data = Experiment(loops)