-the \b maxmin/concurrency_limit item (default value: -1, meaning no such limitation).
-Setting a higher value can lift some limitations, such as the number of
-concurrent processes running on a single host.
+the \b maxmin/concurrency-limit item. The default value is -1, meaning that
+there is no such limitation. You can have as many simultaneous actions per
+resources as you want. If your simulation presents a very high level of
+concurrency, it may help to use e.g. 100 as a value here. It means that at
+most 100 actions can consume a resource at a given time. The extraneous actions
+are queued and wait until the amount of concurrency of the considered resource
+lowers under the given boundary.
+
+Such limitations help both to the simulation speed and simulation accuracy
+on highly constrained scenarios, but the simulation speed suffers of this
+setting on regular (less constrained) scenarios so it is off by default.