DOCS-564 added collection-naming conventions

source/release-notes/2.2.txt

@@ -303,6 +303,52 @@ See: :issue:`SERVER-6961` for more information.
 Behavioral Changes
 ~~~~~~~~~~~~~~~~~~
 
+Restrictions on Collection Names
+````````````````````````````````
+
+In version 2.2, collection names cannot contain the ``$`` character. The
+character is still allowed for collection names in MongoDB versions
+prior to 2.2.
+
+The following is a full list of collection-name restrictions. Collection
+names can be any UTF-8 string with the following exceptions:
+
+- A collection name should begin with a letter or an underscore.
+
+- The empty string (``""``) is not a valid collection name.
+
+- Collection names cannot contain the ``$`` character. (version 2.2 only)
+
+- Collection names cannot contain the null character: ``\0``
+
+- Do not name a collection using the ``system.`` prefix. The ``system.``
+  prefix is reserved for system collections, such as the
+  ``system.indexes`` collection.
+
+- The maximum size of a collection name is 128 characters, including the
+  name of the db and indexes. A best practice is to keep your collection
+  names below 80 characters.
+
+If your collection name includes special characters, such as the
+underscore character, then to access the collection use the
+:method:`db.getCollection()` method or a :api:`similar method for your
+driver <>`.
+
+.. example:: To create a collection ``_foo`` and populate it with
+   document ``{ a : 1 }``, you would issue the following command:
+
+   .. code-block:: javascript
+
+      db.getCollection("_foo").insert( { a : 1 } )
+
+   To query the collection, you would issue the following command and
+   get the following result:
+
+   .. code-block:: javascript
+
+      db.getCollection("_foo").find()
+      { "_id" : ObjectId("506dbf800f70bf70d1ca613b"), "a" : 1 }
+
 Restrictions on Database Names for Windows
 ``````````````````````````````````````````