diff --git a/source/reference/mongodb-extended-json.txt b/source/reference/mongodb-extended-json.txt
index 28f7324c648..4e43c841c21 100644
--- a/source/reference/mongodb-extended-json.txt
+++ b/source/reference/mongodb-extended-json.txt
@@ -98,7 +98,8 @@ Binary
 - ``<bindata>`` is the base64 representation of a binary string.
 
 - ``<t>`` is the hexadecimal representation of a single byte that
-  indicates the data type.
+  indicates the data type.  See the extended bson documentation.
+  http://bsonspec.org/spec.html
 
 Date
 ~~~~
@@ -367,3 +368,5 @@ NumberLong
         - .. code-block:: none
 
              NumberLong( <number> )
+   
+   Number long is a 64 bit signed integer.