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-rw-r--r--guides/source/active_job_basics.md10
1 files changed, 6 insertions, 4 deletions
diff --git a/guides/source/active_job_basics.md b/guides/source/active_job_basics.md
index 76c13f0ea9..d8ea1ee079 100644
--- a/guides/source/active_job_basics.md
+++ b/guides/source/active_job_basics.md
@@ -109,10 +109,12 @@ That's it!
Job Execution
-------------
-For enqueuing and executing jobs you need to set up a queuing backend, that is to
-say you need to decide for a 3rd-party queuing library that Rails should use.
-Rails itself does not provide a sophisticated queuing system and just executes the
-job immediately if no adapter is set.
+For enqueuing and executing jobs in production you need to set up a queuing backend,
+that is to say you need to decide for a 3rd-party queuing library that Rails should use.
+Rails itself only provides an in-process queuing system, which only keeps the jobs in RAM.
+If the process crashes or the machine is reset, then all outstanding jobs are lost with the
+default async back-end. This may be fine for smaller apps or non-critical jobs, but most
+production apps will need to pick a persistent backend.
### Backends