Add note about not blocking job + minor wording fixes

README.md

@@ -260,7 +260,7 @@ second A arrives there are 4 threads running, but only 1 of them is an A thus th
 slot for A jobs so we start the second A on a fifth thread.  The third A, however, has no A jobs
 available so gets queued.
 
-Exmaple 4: BBBBBBAAA.  At most 6 jobs.  The 5th and 6th B's get queued (all general workers are
+Example 4: BBBBBBAAA.  At most 6 jobs.  The 5th and 6th B's get queued (all general workers are
 busy).  The first and second get started (there are two unused reserved A slots), the third one gets
 queued.  The 5th and 6th B's are already interesting on their own: they won't be started until there
 are only three active jobs; the third A won't be started until *either* there are only three active
@@ -273,8 +273,7 @@ when a command with reserve threads arrived.
 ## Internal batch jobs
 
 A common pattern is one where a single thread suddenly has some work that can be be parallelized.
-You could (but shouldn't) employ some blocking, locking, mutex + condition variable monstrosity, but
-you shouldn't.
+You could employ some blocking, locking, mutex + condition variable monstrosity, but you shouldn't.
 
 Instead LokiMQ provides a mechanism for this by allowing you to submit a batch of jobs with a
 completion callback.  All jobs will be queued and, when the last one finishes, the finalization
@@ -350,6 +349,11 @@ in the batch job queue.  This is useful when some event requires triggering some
 you don't need to wait for or collect its result.  (Internally this is just a convenience method
 around creating a single-job, no-completion Batch job).
 
+You generally do *not* want to use single (or batched) jobs for operations that can block
+indefinitely (such as network operations) because each such job waiting on some external condition
+ties up a thread.  You are better off in such a case using your own asynchronous operations and
+either using your own thread or a periodic timer (see below) to shepherd those operations.
+
 ## Timers
 
 LokiMQ supports scheduling periodic tasks via the `add_timer()` function.  These timers have an