3 files changed, 16 insertions, 11 deletions
diff --git a/lib/diameter/doc/src/diameter.xml b/lib/diameter/doc/src/diameter.xml
index b7be184058..0169afb619 100644
--- a/lib/diameter/doc/src/diameter.xml
+++ b/lib/diameter/doc/src/diameter.xml
@@ -799,7 +799,7 @@ be matched by corresponding &capability; configuration, of
 
 <tag>
 <marker id="decode_format"/>
-<c>{decode_format, record | list | map | false}</c></tag>
+<c>{decode_format, record | list | map | none}</c></tag>
 <item>
 <p>
 The format of decoded messages and grouped AVPs in the <c>msg</c> field
@@ -808,10 +808,10 @@ records respectively.
 If <c>record</c> then a record whose definition is generated from the
 dictionary file in question.
 If <c>list</c> or <c>map</c> then a <c>[Name | Avps]</c> pair where
-<c>Avps</c> is either a list of AVP name/values pairs or a map keyed on
+<c>Avps</c> is a list of AVP name/values pairs or a map keyed on
 AVP names respectively.
-If <c>false</c> then the representation is omitted and <c>msg</c> and
-<c>value</c> fields are set to <c>false</c>.
+If <c>none</c> then the atom-value message name, or <c>undefined</c>
+for a Grouped AVP.
 See also &codec_message;.</p>
 
 <p>
diff --git a/lib/diameter/doc/src/diameter_codec.xml b/lib/diameter/doc/src/diameter_codec.xml
index 0846334d23..5124b49484 100644
--- a/lib/diameter/doc/src/diameter_codec.xml
+++ b/lib/diameter/doc/src/diameter_codec.xml
@@ -4,7 +4,10 @@
   '<seealso marker="diameter_dict#MESSAGE_RECORDS">diameter_dict(4)</seealso>'>
   <!ENTITY types
   '<seealso marker="diameter_dict#DATA_TYPES">diameter_dict(4)</seealso>'>
-  <!ENTITY % also SYSTEM "seealso.ent" >
+  <!ENTITY decode_format
+  '<seealso marker="diameter#decode_format">decode format</seealso>'>
+
+<!ENTITY % also SYSTEM "seealso.ent" >
   <!ENTITY % here SYSTEM "seehere.ent" >
   %also;
   %here;
@@ -145,7 +148,8 @@ question.</p>
 <p>
 The decoded value of an AVP.
 Will be <c>undefined</c> on decode if the data bytes could
-not be decoded or the AVP is unknown.
+not be decoded, the AVP is unknown, or if the &decode_format; is
+<c>none</c>.
 The type of a decoded value is as document in &types;.</p>
 </item>
 
@@ -243,8 +247,7 @@ Equivalently, a message can also be encoded as a list whose head is
 the atom-valued message name (as specified in the relevant dictionary
 file) and whose tail is either a list of AVP name/values
 pairs or a map with values keyed on AVP names.
-The format at decode is determined by &mod_service_opt;
-<c>decode_format</c>.
+The format at decode is determined by &mod_decode_format;.
 Any of the formats is accepted at encode.</p>
 
 <p>
@@ -288,15 +291,16 @@ value other than <c>undefined</c>.</p>
 <item>
 <p>
 The incoming/outgoing message.
-For an incoming message, a record if the message can be
-decoded in a non-relay application, <c>undefined</c> otherwise.
+For an incoming message, a term corresponding to the configured
+&decode_format; if the message can be decoded in a non-relay
+application, <c>undefined</c> otherwise.
 For an outgoing message, setting a <c>[&header; | &avp;]</c> list is
 equivalent to setting the <c>header</c> and <c>avps</c> fields to the
 corresponding values.</p>
 
 <warning>
 <p>
-A record-valued <c>msg</c> field does <em>not</em> imply an absence of
+A value in the <c>msg</c> field does <em>not</em> imply an absence of
 decode errors.
 The <c>errors</c> field should also be examined.</p>
 </warning>
diff --git a/lib/diameter/doc/src/seealso.ent b/lib/diameter/doc/src/seealso.ent
index ef6af1a3d0..c5a53670d0 100644
--- a/lib/diameter/doc/src/seealso.ent
+++ b/lib/diameter/doc/src/seealso.ent
@@ -72,6 +72,7 @@ significant.
 <!ENTITY watchdog_timer '<seealso marker="#watchdog_timer">watchdog_timer</seealso>'>
 
 <!ENTITY mod_string_decode '<seealso marker="diameter#service_opt">diameter:service_opt()</seealso> <seealso marker="diameter#string_decode">string_decode</seealso>'>
+<!ENTITY mod_decode_format '<seealso marker="diameter#service_opt">diameter:service_opt()</seealso> <seealso marker="diameter#decode_format">decode_format</seealso>'>
 
 <!-- diameter_app -->