diff --git a/source/reference/limits.txt b/source/reference/limits.txt
index 1de5c4747e8..281ea6bd8de 100644
--- a/source/reference/limits.txt
+++ b/source/reference/limits.txt
@@ -98,6 +98,24 @@ Indexes
 
    There can be no more than 31 fields in a compound index.
 
+Capped Collections
+~~~~~~~~~~~~~~~~~~
+
+.. versionadded:: 2.2
+
+.. limit:: Maximum Number of Documents in a Capped Collection
+
+   You can specify a maximum number of documents when creating a capped
+   collection by setting the optional ``max`` parameter in the
+   :method:`db.createCollection()` method or :dbcommand:`create`
+   command.
+
+   If you specify a maximum number of documents when creating a capped
+   collection, this limit must be less than 2\ :sup:`32` documents. If
+   you do not specify a maximum number of documents when creating a
+   capped collection, there is no limit on the number of documents in a
+   capped collection.
+
 Replica Sets
 ~~~~~~~~~~~~