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-rw-r--r--system/doc/efficiency_guide/advanced.xml29
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diff --git a/system/doc/efficiency_guide/advanced.xml b/system/doc/efficiency_guide/advanced.xml
index 3513a91e34..df2ab0f811 100644
--- a/system/doc/efficiency_guide/advanced.xml
+++ b/system/doc/efficiency_guide/advanced.xml
@@ -238,6 +238,35 @@
<cell>Number of arguments to a function or fun</cell>
<cell>255</cell>
</row>
+ <row>
+ <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
+ 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,
+ references will at earliest be reused after more than 584 years.
+ That is, for the foreseeable future they are unique enough.</cell>
+ </row>
+ <row>
+ <cell><marker id="unique_integers"/>Unique Integers on a Runtime System Instance</cell>
+ <cell>There are two types of unique integers both created using the
+ <seealso marker="erts:erlang#unique_integer/1">erlang:unique_integer()</seealso>
+ BIF. Unique integers created:
+ <taglist>
+ <tag>with the <c>monotonic</c> modifier</tag>
+ <item>consist of a set of <c>2⁶⁴ - 1</c> unique integers.</item>
+ <tag>without the <c>monotonic</c> modifier</tag>
+ <item>consist of a set of <c>2⁶⁴ - 1</c> unique integers per scheduler
+ thread and a set of <c>2⁶⁴ - 1</c> unique integers shared by
+ other threads. That is the total amount of unique integers without
+ the <c>monotonic</c> modifier is <c>(NoSchedulers + 1) * (2⁶⁴ - 1)</c></item>
+ </taglist>
+ If a unique integer is created each nano second, unique integers
+ will at earliest be reused after more than 584 years. That is, for
+ the foreseeable future they are unique enough.</cell>
+ </row>
<tcaption>System Limits</tcaption>
</table>
</section>