diff --git a/examples/threading/producer-consumer.scm b/examples/threading/producer-consumer.scm
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+; TODO:
+; try having multiple producers writing to a queue, and 
+; a consumer reading from it
+; an important consideration is how to let the producers write values, since they would be on their stacks! 
+; ideally do not want the application to have to worry about what value came from what thread...