diff --git a/reference/mongodb/bson/binary.xml b/reference/mongodb/bson/binary.xml
index a49f9ab5cb..d81da420af 100644
--- a/reference/mongodb/bson/binary.xml
+++ b/reference/mongodb/bson/binary.xml
@@ -98,49 +98,50 @@
     <varlistentry xml:id="mongodb-bson-binary.constants.type-generic">
      <term><constant>MongoDB\BSON\Binary::TYPE_GENERIC</constant></term>
      <listitem>
-      <para></para>
+      <para>Generic binary data.</para>
      </listitem>
     </varlistentry>
 
     <varlistentry xml:id="mongodb-bson-binary.constants.type-function">
      <term><constant>MongoDB\BSON\Binary::TYPE_FUNCTION</constant></term>
      <listitem>
-      <para></para>
+      <para>Function.</para>
      </listitem>
     </varlistentry>
 
     <varlistentry xml:id="mongodb-bson-binary.constants.type-old-binary">
      <term><constant>MongoDB\BSON\Binary::TYPE_OLD_BINARY</constant></term>
      <listitem>
-      <para></para>
+      <para>Generic binary data (deprecated in favor of <constant>MongoDB\BSON\Binary::TYPE_GENERIC</constant>).</para>
      </listitem>
     </varlistentry>
 
     <varlistentry xml:id="mongodb-bson-binary.constants.type-old-uuid">
      <term><constant>MongoDB\BSON\Binary::TYPE_OLD_UUID</constant></term>
      <listitem>
-      <para></para>
+      <para>Universally unique identifier (deprecated in favor of <constant>MongoDB\BSON\Binary::TYPE_UUID</constant>). When using this type, the Binary&apos;s data should be 16 bytes in length.</para>
+      <para>Historically, other drivers encoded values with this type based on their language conventions (e.g. varying endianness), which makes it non-portable. The PHP driver applies no special handling for encoding or decoding data with this type.</para>
      </listitem>
     </varlistentry>
 
     <varlistentry xml:id="mongodb-bson-binary.constants.type-uuid">
      <term><constant>MongoDB\BSON\Binary::TYPE_UUID</constant></term>
      <listitem>
-      <para></para>
+      <para>Universally unique identifier. When using this type, the Binary&apos;s data should be 16 bytes in length and encoded according to <link xlink:href="&url.rfc;4122">RFC 4122</link>.</para>
      </listitem>
     </varlistentry>
 
     <varlistentry xml:id="mongodb-bson-binary.constants.type-md5">
      <term><constant>MongoDB\BSON\Binary::TYPE_MD5</constant></term>
      <listitem>
-      <para></para>
+      <para>MD5 hash. When using this type, the Binary&apos;s data should be 16 bytes in length.</para>
      </listitem>
     </varlistentry>
 
     <varlistentry xml:id="mongodb-bson-binary.constants.type-user-defined">
      <term><constant>MongoDB\BSON\Binary::TYPE_USER_DEFINED</constant></term>
      <listitem>
-      <para></para>
+      <para>User-defined type. While types between 0 and 127 are predefined or reserved, types between 128 and 255 are user-defined and may be used for anything.</para>
      </listitem>
     </varlistentry>