diff --git a/lib/mongo/collection.rb b/lib/mongo/collection.rb
index 1ad1bc7..5f0a01b 100644
--- a/lib/mongo/collection.rb
+++ b/lib/mongo/collection.rb
@@ -184,7 +184,7 @@ module Mongo
     #   end of the query's execution.
     #   For details see http://www.mongodb.org/display/DOCS/How+to+do+Snapshotting+in+the+Mongo+Database
     # @option opts [Boolean] :batch_size (100) the number of documents to returned by the database per
-    #   GETMORE operation. A value of 0 will let the database server decide how many results to returns.
+    #   GETMORE operation. A value of 0 will let the database server decide how many results to return.
     #   This option can be ignored for most use cases.
     # @option opts [Boolean] :timeout (true) when +true+, the returned cursor will be subject to
     #   the normal cursor timeout behavior of the mongod process. When +false+, the returned cursor will
diff --git a/lib/mongo/cursor.rb b/lib/mongo/cursor.rb
index 95af195..a1367a4 100644
--- a/lib/mongo/cursor.rb
+++ b/lib/mongo/cursor.rb
@@ -258,6 +258,9 @@ module Mongo
     #
     # Note that the batch size will take effect only on queries
     # where the number to be returned is greater than 100.
+    # 
+    # This can not override MongoDB's limit on the amount of data it will
+    # return to the client. Depending on server version this can be 4-16mb.
     #
     # @param [Integer] size either 0 or some integer greater than 1. If 0,
     #   the server will determine the batch size.