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-rw-r--r--system/doc/efficiency_guide/advanced.xml7
-rw-r--r--system/doc/tutorial/port_driver.c3
2 files changed, 5 insertions, 5 deletions
diff --git a/system/doc/efficiency_guide/advanced.xml b/system/doc/efficiency_guide/advanced.xml
index bb4440a245..896eda5f1c 100644
--- a/system/doc/efficiency_guide/advanced.xml
+++ b/system/doc/efficiency_guide/advanced.xml
@@ -255,10 +255,11 @@
<cell><marker id="unique_references"/>Unique References on a Runtime System Instance</cell>
<cell>Each scheduler thread has its own set of references, and all
other threads have a shared set of references. Each set of references
- consist of <c>2⁶⁴ - 1</c> unique references. That is the total
+ consist of <c>2⁶⁴ - 1</c> unique references. That is, the total
amount of unique references that can be produced on a runtime
- system instance is <c>(NoSchedulers + 1) * (2⁶⁴ - 1)</c>. If a
- scheduler thread create a new reference each nano second,
+ system instance is <c>(NoSchedulers + 1) × (2⁶⁴ - 1)</c>.
+ <br/><br/>
+ If a scheduler thread create a new reference each nano second,
references will at earliest be reused after more than 584 years.
That is, for the foreseeable future they are unique enough.</cell>
</row>
diff --git a/system/doc/tutorial/port_driver.c b/system/doc/tutorial/port_driver.c
index 37de67310f..8b441733ed 100644
--- a/system/doc/tutorial/port_driver.c
+++ b/system/doc/tutorial/port_driver.c
@@ -51,8 +51,7 @@ ErlDrvEntry example_driver_entry = {
queue */
NULL, /* F_PTR call, much like control, sync call
to driver */
- NULL, /* F_PTR event, called when an event selected
- by driver_event() occurs. */
+ NULL, /* unused */
ERL_DRV_EXTENDED_MARKER, /* int extended marker, Should always be
set to indicate driver versioning */
ERL_DRV_EXTENDED_MAJOR_VERSION, /* int major_version, should always be