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-rw-r--r--lib/diameter/doc/src/diameter.xml17
1 files changed, 13 insertions, 4 deletions
diff --git a/lib/diameter/doc/src/diameter.xml b/lib/diameter/doc/src/diameter.xml
index fdd18929df..0bfbf62cd3 100644
--- a/lib/diameter/doc/src/diameter.xml
+++ b/lib/diameter/doc/src/diameter.xml
@@ -463,6 +463,10 @@ specified list.</p>
</taglist>
+<p>
+An invalid filter is equivalent to <c>{any,[]}</c>, a filter
+that matches no peer.</p>
+
<note>
<p>
The <c>host</c> and <c>realm</c> filters examine the
@@ -473,13 +477,18 @@ the message contains at most one of each AVP.
If this is not the case then the <c>{host|realm, <seealso
marker="diameter_dict#DATA_TYPES">DiameterIdentity()</seealso>}</c>
filters must be used to achieve the desired result.
-An empty host/realm (which should not be typical)
-is equivalent to an unspecified one for the purposes of filtering.</p>
+An empty <c><seealso
+marker="diameter_dict#DATA_TYPES">DiameterIdentity()</seealso></c>
+(which should not be typical)
+matches all hosts/realms for the purposes of filtering.</p>
</note>
+<warning>
<p>
-An invalid filter is equivalent to <c>{any,[]}</c>, a filter
-that matches no peer.</p>
+A <c>host</c> filter is not typically desirable when setting
+Destination-Host since it will remove peer agents from the
+candidates list.</p>
+</warning>
<marker id="service_event"/>
</item>